Get tall players 6'11 or taller. I can't emphasize this enough. Inside skills train really fast with taller players. Try to get prospects with good outside skills. Yes outside skills, not inside. Most rookie trainers go for high inside starting skills but better prospects are well rounded with nice outside skills. What can hold you back is your division. Division 4 does have its constraints, less revenue for one. You should be able to afford them for 3 seasons.