Jackpot! Lucky duck.
1. Id strongly advise a level 5 or 6 trainer. This guy is worth it.
2. Id strongly advise a youth trainer. The results i got testing last season showed it was worth it.
3. Agree that SF is a great option, but you need to be in for the long term. You could also train him to be a PF, SG, even a PG if thats your need.
4. Where to start... if you want a PF id start inside- train inside shot and inside D right away. If its a guard, one to one fwds. If its a SF, you can start inside skills or one to one. Personally id get him going inside early- inside shot up to 10, then inside D up to 10. From there you can go to OD and js. The main 4 primaries for a SF are IS, ID, JS and OD. But passing, rebounding and JR can all be very useful and not neglected.
Ill keep in touch.