Mike

There are several good threads on Trainers in the beginners forum, You may want to look thru some to get an idea, Search that forum for, Best Trainer

The radio equipment varys with the type and retailer, in general a 4 channel and glow engine can be moved to other aircraft as needed.

The most mentioned right now are the Hobbico Avistar and Superstar, the PT trainer and the Cadet.

There are many retailers with a wide range of options and prices, Tower Hobbies.com Horrizonhobbies.com Hobbytownusa.com and many more.

Welcome to RCU and RC, Enjoy