I think OPs feedback is quite good and has a lot of valid points, if you try to look at it from the POV of a new player. Not everyone will read the forums here and spend hours to look at videos.
Here my comments, directed to CemXen:
1) The UI - not much can be done. Yet one hint: I optimized my settings (I play with keyboard and mouse) during the first training mission (not in game, the training missions they offer). After you end the conversation and the frist steps in this mission she tells you to fly towards a station. And here you have unlimited time, and can fiddle around with your key/mause stting for flight. Here I decided which keys/mouse I would like fly with, and optimized the settings.
2) Missions: If you are asked to 'source' something, i.e. to buy a certain amount and deliver it to the mission giver, I do not know if you need to actually buy the stuf after taking on the mission. You should be able to use stuff you already have, but I never tried it. In delivery missions you MUST use the stuff they give you, and not stuff you already have or stuff you will buy.
3) The SC assistant - is entirely superfluous IMHO. The 7 seconds rule you already know. You also know now that you have to go around things, where the SCA is no help anyway. The 'K' button is not mapped by default (or was not, when I started). The 'J' button is both, activate SC or jump. If you have a jump target, it will jump, it will engage SC otherwise. Forcing SC and NOT jump despite having a jump target is very helpful, if you need to enter SC despite having a jump target, this could be the 'K' button.
The slow down message was already explained here. My experience is: Full throttle is fastest, but if you thunder full throttle through a system you sometimes will receive the message. Sometimes you can ignore it safely, sometimes not.
The best practice is to set a button (F8 in my case, for example) to 75% throttle. If you receive the Slow Down message, just hit this button. NEVER drop from SC during full throttle, this will damage the FSD. There is a default button 'X' which will set throttle to zero. If you think you need to stop or slow down, hit it, and your speed will go down, without you leaving SC or do damage to the FSD. Also, if you hit the 75% button in time while flying toward a station, SC will regulate itself optimal so that you can drop out. You should train this until it is second nature - if you do delivery jobs it makes your journeys fast, and safe, since you advance toward your target fast and can use an unpredictable course which will help against interdictions.
4) Combat - absolutely valid point, despite what others are saying here. It is idiotic (yes I mean it) to make a newbie zone and adding a full strength combat zone. Typical Frontier half measure. CZs are where people expect the hardest combat (except Thargiod encounters maybe)). But a new player cannot know this. If you want to train combat either use the missions in the tutorial, or in game use RES zones, starting with low RES. And you are not the first to fall for this. People here are playing for years, experiencing many updates (and bugs galore), so for them it is clear. But a newbie zone should not assume that it is clear for everyone, this is the point, isn't it??
So the CZ in the so called newbie zone is best avoided.
5) Graduation, leaving the newbie zone (loosing the permit) is not explained too, and you are not the first player baffled by it. When I started there was no newbie zone yet (February 2019) and I will NOT reset my commander for this. But ParaHandy reset his commander and pointed out, that you are never forced to leave the newbie zone, and that the 'go out' mission you are offered can be delayed until you are ready to do so. And FLYING outside the zone will not end the permit, as Para Handy pointed out, only docking outside will do that, and every time, even before you have your first rank.
So you can stay and play in the zone as long as you like!
Therefore routing through a system outside the zone will NOT loose the permit, but if you dock in this system, you ill loose it, regardless if you have the rank or not. This should be better explained indeed in game.
You can do everything inside the newbie zone except exploring, so you can comfortable stay there as long as you like. Trading or mining do not involve missions, so just do it and try it out.
Good feedback from the POV of a new player - we can hope somebody from Frontier reads it and acts on it.
Here my comments, directed to CemXen:
1) The UI - not much can be done. Yet one hint: I optimized my settings (I play with keyboard and mouse) during the first training mission (not in game, the training missions they offer). After you end the conversation and the frist steps in this mission she tells you to fly towards a station. And here you have unlimited time, and can fiddle around with your key/mause stting for flight. Here I decided which keys/mouse I would like fly with, and optimized the settings.
2) Missions: If you are asked to 'source' something, i.e. to buy a certain amount and deliver it to the mission giver, I do not know if you need to actually buy the stuf after taking on the mission. You should be able to use stuff you already have, but I never tried it. In delivery missions you MUST use the stuff they give you, and not stuff you already have or stuff you will buy.
3) The SC assistant - is entirely superfluous IMHO. The 7 seconds rule you already know. You also know now that you have to go around things, where the SCA is no help anyway. The 'K' button is not mapped by default (or was not, when I started). The 'J' button is both, activate SC or jump. If you have a jump target, it will jump, it will engage SC otherwise. Forcing SC and NOT jump despite having a jump target is very helpful, if you need to enter SC despite having a jump target, this could be the 'K' button.
The slow down message was already explained here. My experience is: Full throttle is fastest, but if you thunder full throttle through a system you sometimes will receive the message. Sometimes you can ignore it safely, sometimes not.
The best practice is to set a button (F8 in my case, for example) to 75% throttle. If you receive the Slow Down message, just hit this button. NEVER drop from SC during full throttle, this will damage the FSD. There is a default button 'X' which will set throttle to zero. If you think you need to stop or slow down, hit it, and your speed will go down, without you leaving SC or do damage to the FSD. Also, if you hit the 75% button in time while flying toward a station, SC will regulate itself optimal so that you can drop out. You should train this until it is second nature - if you do delivery jobs it makes your journeys fast, and safe, since you advance toward your target fast and can use an unpredictable course which will help against interdictions.
4) Combat - absolutely valid point, despite what others are saying here. It is idiotic (yes I mean it) to make a newbie zone and adding a full strength combat zone. Typical Frontier half measure. CZs are where people expect the hardest combat (except Thargiod encounters maybe)). But a new player cannot know this. If you want to train combat either use the missions in the tutorial, or in game use RES zones, starting with low RES. And you are not the first to fall for this. People here are playing for years, experiencing many updates (and bugs galore), so for them it is clear. But a newbie zone should not assume that it is clear for everyone, this is the point, isn't it??
So the CZ in the so called newbie zone is best avoided.
5) Graduation, leaving the newbie zone (loosing the permit) is not explained too, and you are not the first player baffled by it. When I started there was no newbie zone yet (February 2019) and I will NOT reset my commander for this. But ParaHandy reset his commander and pointed out, that you are never forced to leave the newbie zone, and that the 'go out' mission you are offered can be delayed until you are ready to do so. And FLYING outside the zone will not end the permit, as Para Handy pointed out, only docking outside will do that, and every time, even before you have your first rank.
So you can stay and play in the zone as long as you like!
Therefore routing through a system outside the zone will NOT loose the permit, but if you dock in this system, you ill loose it, regardless if you have the rank or not. This should be better explained indeed in game.
You can do everything inside the newbie zone except exploring, so you can comfortable stay there as long as you like. Trading or mining do not involve missions, so just do it and try it out.
Good feedback from the POV of a new player - we can hope somebody from Frontier reads it and acts on it.