Hehe not an easy question, "tell me everything"
If you want to play MyCareer mode (if that is what you meant) then hopefully I can offer you some advice in my videos:
http://www.youtube.com/user/apriliand1975
Check the NBA 2K13 and ...14 playlists, last year I made some more basic videos too that might help you, you might want to start there.
In my opinion playing a bigman (Power forward or Center) is easier than a guard or a small forward - your job is more straightforward.
I do not play the other gamemodes, only MyCareer.
Best advice: play, enjoy it and learn while you play.