Let me suggest that you read the documents and tips on this site to get an overview of the GTD methodology. Then, I'm sure there are many here who would be happy to answer your questions about how to apply it to your situation.
However, I doubt that many of us have time to explain the whole GTD system to you in a posting on this board.
While you are here check out David's books and Cds for information on how to use the system. Short of one of his seminars that's the best way to get a grasp of it. However, one can get a pretty good idea just by reading the columns and articles available free here.
Welcome to the Board and I hope you find what you are looking for.