Congratulations to you and Nighthawk for your willingness to invest in someone's future.

At 15, he's not still a boy and not yet a man. I don't think he can be treated as either. If he's like my kids, the "stuff" (rods, reels, waders etc) isn't as important as having someone he can trust, communicate with and model himself after. The trips fishing, hunting and to the target range are the vehicle to build that foundation. (I think camp fire time is far more important than casting time). Remember too, he may not enjoy one or more of those activities. Give him exposure to them and focus on his preference.

Best Wishes to you all.