It probably makes most sense to turn him into a Small Forward. His current given position means very little. His length determines which skills will train faster/slower. With his middle of the road length he can train both some outside and inside skills at an average pace and he starts of with decent OD.
I think you could start with 1 vs 1 which would improve DR/HD/IS/JS and then upgrade his OD. At some point you could decide whether you want him to be really good inside with high IS or improve that JR more so that he does well in outside offenses. Or go for a balance between the two if that's what you prefer. ID and RB are also nice to have on a SF.
this is not a fully optimized training plan but just some thoughts to give you some direction. It might also be a good idea to ask your countries NT coach for advice since this could be a future NT player (and U21)
Crunchy! If you eat fast enough