Hi farrokh,
I would take the advice given above. BUT, if you insist on learning, learn with something that stays on the floor. Like a car first!
I don't know the frequencies for aircraft or cars in China. In UK we have 27mhz for cars and 35mhz for aircraft. Except now, they have changed to 2.4ghz. The original frequencies are still allowed.
Learn the basics of communication first. Then you can expand on channels, distance etc.
Have a good read of this
tutorial about 27mhz comms. It has a parts list and schematic too.
Remember, you have to start somewhere
Martin