Builiding simple radio controlled switch

hi friends,
I have completed my first year in electronics engineering and have idea of basic electronics and circuit analyzing.I want to build a simple radio controlled switch .Can you guide me as to how to go about making it..Where should I start from...Any good references/books...
I searched net but couldn't find till now circuit schematics for building one...
most sites show how can we use readymade rf modules ,or using modules from rc cars or cordless remote bells and modifying it according to use...But I want to build a rf switch from scratch...as in want to understand the basic principles and design one myself...please help...

You are correct in that most people by radios.

What you need to do is first build a radio transmitter and receiver.
You can search this forum and other sites on the web for plans.