the quickest way -- one that would probably be successful in div. V -- is work on jump shot (JS), jump range (Outside shooting), and driving (One on One). If you are thinking long range, then you need players to get him the ball (Passing); he becomes more valuable if he can play defense (Pressure, some Handling); and teammates that can do their fair share (play defense, rebound, pass, and occasionally shoot).
The game is changing -- be prepared for a substantially higher level of competition with each rise in division level. Don't neglect revenue demands (arena expansions). You want to have as good a trainer as you can reasonably afford. And scouting may be a cheap way to procure prospects.
Good luck.