Hello M. Lewis, and welcome to SR. I've asked the moderators to move this over to Newcomers, in the meantime I'll try to answer some of your questions.
For a newcomer to AA I'd recommend an open newcomers meeting, but he will find support at any meeting, for the most part we are all very welcoming and supportive to anyone who has the desire to stay sober.
AA meetings can be as small as two people, or sometimes there are hundreds, it just depends on the group. At our club we have members as young as 14, alcoholism doesn't discriminate by age so neither do we.
I hope he finds a meeting that he feels good about, and I also hope you'll consider checking out Al-Anon, it might be good for you to be informed and think about recovery and taking care of yourself too.
Please look around here for more info
http://www.soberrecovery.com/forums/...-about-aa.html