My son surprised me this summer by informing me he was 220 pages into a fantasy novel. He has been working diligently on it, and on world building, and has now started his own blog about the writing, editing and selling process, http://maxximenez.livejournal.com/. It is aimed at other young writers, as well as first time authors.
Please encourage him, give him links to helpful sites, and make him feel part of the writing community.
I have not read his novel, but I have put him in touch with good writing friends who are guiding him.
I will not represent him, but I will lead him to the right people.
This should be a very interesting experience.