Also, unless you are Mr. money bags I would avoid the donation missions. You may gain rank quicker but do you know how much a Corvette costs? The money you make from the missions will be needed to pay for it.
The money from passenger missions will MORE than pay for those donations. I took every single donation mission offered to me, including the million cr ones. I easily afforded them. Between Cadet and Admiral, I made around 300 million credits. Passenger missions are very lucrative for money. Fast turnoever and low risk as well.
N.B. I got bored of running passengers, they are good for cash but you complete relatively few trips compared to missions and you have to put up with their demands.
LOL no...unless they are luxury passengers, you can completely ignore their demands. I've never had problems ignoring them, and I've done hundreds of missions. For transport missions, their demands mean nothing. The only exception is Luxury passengers (which is why I don't do luxury passengers).
The main thing that can trip you up is illegal passengers (the money is usually good though, so it is worth learning how to stealth-dock...and it's entertaining because it can be challenging), passengers being scanned (I always evade scans, if for no other reason than practice), and getting attacked (a lot of passengers don't like hull damage). Some passengers will also get y if you break laws, like speeding and hitting another ship on the way out of dock.
But their demands mean almost nothing. The only time it might be a problem is "adventure" passengers. You can generally ignore their demands the first couple times...after that you risk losing them. For passenger missions that are less than 10 jumps, this is never an issue for me.
Adventure missions can be a problem because they are so long. I don't do adventure missions often because you cannot complete them till you return to the station...as opposed to transport missions, which are done once you reach the destination. So Adventure missions are hard to stack, and do not have a fast turnover, and you risk losing them if you fail to meet passenger demands. This matters if you goal is making money/trip or building rank quickly.