I am doing a lot of smuggling in imp slaves. Actually don't even think about getting scanned. Just approach from planet side, keep speed high by boosting and make sure you reach the mail slot soon.
Actually it helps hitting the walls of the mail slot to lose some speed to speed up docking. Running o low weight conda with 5a power and 7d thrusters, 4a docking shield.
I don't recall ever being scanned and if you're after profit/h you need to dock quick in any case.
Btw. I started sidey, then hauler, cobra, type 6, type 7, type 9. The type 9 is a pain really. No surprise. But as to the 6 and 7 I could evade most interdictions without trouble in those. Agree with previous posters, don't upgrade when you just got the money for the base ship. Keep your old ship for safety, upgrade the new ship FSD to A spec (and obviously the cargo racks), at least d thrusters, too. Keep enough money for the insurance and take care.
I haven't tried 3rd party tools for trading though I admit I coded a little to gather my own price data and derive some multi-hop routes. I spent days exploring and finding some good routes which was a big motivator for me.
Whenever I get bored of running the same route all over I head off somewhere else to ease the itching question of whether there is a better route out there... trust me, every time I started off I finally found one
Another one: Respect player pirates. If they interdict you and you got no means to fight, yield. They have a codex. They will let you get away with your ship (and possibly some cargo). And it adds to the gameplay, I really loved some of the encounters. Don't combat log.
If you ever get killed on sight without any roleplay, move somewhere else for a while. You can't completely avoid it without soloing (which would kill the fun) as there are some players without manners or honour out there. Calculate the loss and be prepared. Avoid player infested areas like CG if you are alone in a weak ship or are low on funds. Happened to me only twice since I started the game (I was in in beta), most of the players I met were quite nice guys.
Safe trading, mate.
See you out there.