Here is the way I have my "$20 catch can" mod hooked up. Except my catch can is in a different location and I don't have a breather on my Valve Cover as pictured here. I still have a vaccum line connecting it to the intake.
I did a search and I didn't realize how many different ways people are hooking these things up, sorta confusing on some. This was the original way I saw how to do it and I haven't had any problems yet.