Well for a start, one on one doesn't train passing, so you can scrap that idea.
He's pretty good, his secondaries are nice (except the passing), so I'd suggest smashing the inside skills till he's 20, triple sensational if possible.
After that, work on passing and jump shot by training him as a guard. This will keep his salary down, and make him a very well rounded player.
Maybe when he turns 21 again you can polish off the big man skills, triple wondrous (IS, ID, RB), then go back to guard skills before he caps.