Puppies can be expensive especially the first year. Yorkies from a reputable breeder will normally cost between $1,000 and $2,500. Do you have a job? Will you eventually be going to college? If yes what will happen to the dog? Here are some links to check out.
The Cost of Owning a Dog,
http://www.yorkietalk.com/forums/bre...e-breeder.html,
http://www.yorkietalk.com/forums/pup...uy-yorkie.html. The one about the cost break down I think is a little more then that in the first year.