The way to get started in R/C Airplanes is too go too your local hobby shop. There you can ask the people of the store to help you make the right decision on what kind of trainer to get and get you hooked up with the ground equipment! Also join a local club where you will find several people in the club that are instructors to help you learn how to fly. For those who don’t have a hobby store around, use a mail order company to get you started. Here is a list of equipment you need to get started.
A good 40 to 60 size Trainer. (Preferably an ARF)
Engine
4 Channel Radio with receiver and servos
Fuel Pump to fuel your airplane
Glow Starter
Simple tools to change props and fix airplane
Epoxy and CA
Glow Plugs
Props
Flight Box
Electric Starter
12 volt Battery
Recommend fuel for your engine
And any thing else that your Airplane needs to make it fly.