It is always nice to see someone being fascinated with Bricks just as much as me!
I would say that depending on the potential of the player, you have at least 3 ''general'' builds: Offensive, Defensive, Allround.
Does your team require more outside presence in offense? More JS. You have bad inside presence? More IS for offense, or more REB if your Bigs dont seem to get enough boards (REB on SF has more impact in the engine, than on PG or SG).
Also another question: Do you want to have a salary efficient player until he's 24 years old, or you don't care if he reaches 150k when he's 22 years old?