Welcome to YT! There are a great many things to consider before breeding your male. You may want to use the search feature here to read over various posts on the subject. It is also not customary to charge a stud fee with an unproven male and it is unheard of in yorkies to charge price of a pup, though occasionally a pup back is required for service.
here's a thread to get you started
http://www.yorkietalk.com/forums/showthread.php?t=30556