It's actually hard to go wrong these days with a trainer. As you look at them, youi'll noticed they are all very similar to each other, because it's been a solid 40 years since the hobby as a whole figured out what works. So pick any of the classics- the Sig Kadet series and LT-40, the Hobbico Nexstar and Avistar Elite (my personal favorite), the Hangar 9 Arrow, and many others. Buy from a reputable manufacturer (not Banana Hobby, Nitroplanes, or Hobby King) and you'll get a nice flying and durable plane to learn on. It will behoove you to get an instructor for at least your first few flights to avoid some of the newbie mistakes that can cause crashes, but with any of those planes you should get it together pretty quick.
Also, if you will have a look at the beginner forum, there is an extensive trainer list and there is also a website called www.gettingairborne.com
that a couple of RCU veterans put together for RC beginners.