Is there any recommended training for new players? Right now I thought about buying 5-6 guards and train Jump Shot (2 postions clearly..)
I think you started well. Some of your rookies lack in potential; I would advise to replace those 6thmen and starters for at least "allstar" potential 18y olds. 18y olds train quite fast. I think for a D.IV and maybe even D.III two-position training is enough .Later on, maybe you would switch to one-position training,.
-What levels should my trainees have? In my mind respectable in the main skills should be good?
I'd say look for 18y old trainees with at least 3.5k - 4k salary and good distribution of skills. Since you are training guards, try to find some that have no less than "Mediocre" (5) in any of the guards skills (JS, JR, OD, PA, HA and DR). Or if you are training Shooting guards, he can have less PA, but have to compensate with JS and JR...and so on.
-When should I sell my trainees?
Why would you sell them? I mean, are you training them to make your team better or are you training them for profit? If you want to promote in few seasons, I guess it would be wise to keep at least three of them...
-Is there any way to adjust the minutes each player plays? I mean if a player played 30 minutes, and in another game I want him to play exactly 18 minutes and the other 30 minutes for another trainee, is there any way of doing that?
Yes, there are ways to do that, but not in the "I enter the exact minutes I want" way. The best way to get 48 minutes out of a trainee is to play him 48 minutes in one game.
-Oh and almost forgot, what does offensive flow means in the grades at the end of the match?
Offensive flow reflects HA and PA of your team, where PG and SG weigh the most. So better offensive flow means less turnovers and more assists.
You are welcome!