I would send him to camp this summer. The Santa Clarita Quail and Upland Wildlife Federation holds a Hunter's Safety / Shooting Camp every year. Our daughter started going when she was 11, passed her hunter's safety test and was able to shoot all types of guns. It is almost a week away from home, well supervised by very knowledgeable and Pro-2A folks and provides lots of experienced while being in a camp environment (all that is my words, not from the site).
Check it out:
BTW: They fill up FAST so if you are interested, I would get him enrolled right away.