Well... radio communication systems are fairly complex and it's not like an Arduino kind of deal where you could bread board things and make it work. There are many system level, modulations type, hardware, and software considerations that need to be worked out. Modern RF transceivers are designed by a group of engineers each with a different specialty. For example one designs the oscillators, one designs the amplifier, another one does the system integration, a somebody is doing the digital interface and software work. Here is a decent book on receiver architecture. Here is a more circuit design related text. You can also search for a communications systems text books for a more thorough treatment.
Now if you just want to make something work like RC toys (for the lack of a better word), there are RF TX/RX IC's readily available that have the whole system integrated with a digital interface. I suggest searching for "RF Transceivers" on Texas Instruments, Analog Devices, MAXIM, Microchip, and Cypress. They typically have a demo board that has everything you need on a board to start.
I hope this is helpful. Let me know if you have more questions. I do RF and microwave circuit design for living.