The return of serve is the second most important shot in tennis. If you can't figure out the first, may I suggest Google...
There are some very important aspects to the return, but I am just going to focus on the first two parts of the return. The first is the split-step!!! Do it every time!!! Here is a good video about the split-step.
The second part is the split-step. Ok, that's a joke...but in any case that is all I want you to think about when you are returning. The reason I am so focused on the split-step is because I have watched too many of you just stand there and not split when the server is making contact! Here is another good video.
Keep on splitting Cats!!!