I found this text book online. It might be an interesting read. Lot of basic circuits and code example..
http://www.mikroe.com/en/books/picbook/0_Uvod.htm
As far as the code to switch on/off the light goes, it should be simple enough to do once you are familier with the architecture and programming. Sorry, I don't have any code with me, someone else might help you. Also check the microchip website, they have loads of application notes dealing with almost anything imaginable including ESCs for RC applications.
Regards,
Prasanna.