Can anyone help? I am new to this and I am wondering if anyone can guide me on how much to charge for using my dog to service a bitch?

Wow, big question! It depends on what breed, what has he won, who and what are his parents and grand-parents. Has he and parents all had relevant health checks, with resulting favourable results. Probably a whole lot of other factors to consider before setting a stud fee, but if you are so new to this are you positive he is suitable for use at stud?
bye
Gwen