I'm not sure if the other poster mentions linx technologies my apologies I cannot see the link, they have a lot of information on design and FCC requirements and such. Not so much on actual programming though, which is what I'm after myself. In particular NRZ (manchester) programming for a PIC
I see that you have 3 posts, therefore you will need 4 posts more to see the links. For 7 posts your rank will be Newbie. About RF design look for product of Nordic Semiconductor. They have very cheap and effective wireless products.