The right tools for the job
Before you begin you must make sure that you use the right tools for the job. Read this site carefully with all it's instructions waiting for you to get you going on this journey of DIY domotica. Make sure you read the wiki before buying a sender or receiver. If you still decide to buy the hardware on your own or against our advice, you cannot expect the community to help you out.
So, buy the right tools for the job and get started!
Any questions because you cannot find it in the wiki or on this site? Try to get help on the forum or just contribute by helping others.
A receiver needs a good band-pass-filter. If you want to get started quick read this, and get going without any hassle!