RE: What Radio?
I'd have to agree with Bakes on the radio issue. If you're considering saving money by not buying a starter, then skip the computer radio for now. SpaceClam is right about the 6 channel computer if you can afford it, but there's nothing wrong with starting out with a basic 4 channel.
I would seriously recommend that you find a local club and join, then talk with an instructor. You'll be better off buying radio equipment that's compatible with his. They'll also likely recommend an airplane that they're used to training on.
Quite often, someone at the local club will have a used trainer and radio equipment that will save you a lot of money in the long run.
You will also need to join the AMA for the liability insurance. But it's very inexpensive for anyone under 16. I believe it's only a $1.00, but you won't get the magazine. Virtually every club requires AMA membership.
But go visit the club's flying field and get to know some people. I'm guessing they'll put you on a Buddy Box for a flight or two that day. Go on a Saturday or Sunday around mid-day.
Good luck, and welcome!!
Dennis-