I've been flying them for some time, and I guarantee you'll get more adrenaline rushes than in a roller coaster!! (if you fly 3D like me that is
What Gabriel said pretty much sums it up.
Hmmm... a good trainer plane would be this: http://www.horizonhobby.com/Shop/ByCategory/Product/Default.aspx?ProdID=HAN2475
I like hangar 9 a lot, and the alpha trainer is at a very good price.
Be aware, DON'T buy one of those toy-like electric trainers, they're just as expensive as gas powered ones, fragile, and have crappy "handling". And if it's gas powered, dont' buy anything smaller than a .40 sized trainer. (.40 means engine size for a given plane) , and .40 is the most common size and there are a lot of models to choose from. From there up you have typically .60 .90 and 1.20 sizes, but I've never seen a trainer above .60 . Usually in a trainer, the larger the wingspan (60in. plus) the more stable it is.
Also, don't let them fool you into buying a $200 r/c simulator, you're better off practicing in MS
Flight Sim 2004, that helped me get the "feel" real quick.
Please keep us posted and if you have any questions, we've got answers!