RE: transmitters
As stated, take a look at your goals. If you want to get into it, see if you like it and you think you are going to quit right away, get cheap stuff. If you are going to stay with the hobby, get good stuff or you won't like the hobby. The cheap stuff is just that. Cheap. The good stuff will last a long time.
40 size trainer, good 4 to 6 ch radio, good engine.