From what i have gathered about learning to fly and flight sims and stuff (and i am no expert at all) You have to get the brain trained to push a little stick in the right direction at the right time. It is a lot like learning to play a playstation very quickly and a bit more complex. This is the sim we have got but a newer version and it comes with the special transmitter which plugs to the PC and the software (can download tonnes of planes too!) My preschool girls like playing around with it even!
http://www.trademe.co.nz/Toys-models/Radio-control/Planes/auction-142592318.htm
I have even had a play with the sim myself and once i got the hang of turning in a circle (a controlled circle not random flying spaztically round all over) i realised that it is very difficult for me. And i have a huge respect for the fact that my hubby can throw planes round in the sky as natually as blinking as eye. He has just started advanced aerobatics.
The tx (transmitter) has the sticks/controls which you manouver and it sends your instructions to the plane ie "go up", "go left",etc.
The rx (reciever) picks up the instruction and unscrambles it to tell the various parts of the plane what to do to acheive your request. The servos are the things that make those parts move.
http://en.wikipedia.org/wiki/Servomechanism