@beachymom In my opinion, the best thing to do right now is to find a really good private voice teacher who can teach MT vocal technique for the male voice. The other thing I would highly recommend is to have him apply to national level MT summer programs (or at least major regional programs) for this summer or next, preferably this summer if you can afford it and get those applications done (deadlines looming).
The voice lessons will give him the tools he needs, and good technique takes a while to hone. The summer programs will be fun, he will learn, and most importantly he will see what it really means to major in MT and what the talent level is nationally.