Help with SourceSDK Mapping

I installed SourceSDK the other day and when I launched it, I didn’t know what do do. I was messing a round with it and decided to figure out how to map. Can anyone tell me what I have to have installed and what to do. If you do, thank you very much then.

This is all you need: http://www.facepunch.com/showthread.php?t=519418