Travis... there are tons of sites that have lots of information regarding green/blue screen techniques and methods...
If you do a google search you will find some good explanations on how to go about doing this... however, like all methods... each will be slightly different and each will have some advantages and disadavantages. (Google Key words - chroma key, green screen or blue screen).
As for lighting... again,... that too is discussed at the sites that discuss green/blue screen.
You might post this question here:
http://forums.creativecow.net/forum/lightingdesignpros
You might get better results... or, better yet do a search that forum site and you may find your solution already thoroughly explained.
Here is a link that has a pretty good thread concerning your question:
http://www.mediacollege.com/video/special-effects/green-screen/
Joe
