Welcome to yorkie talk!
We just brought Suri home recently.
I would recommend looking for a vet and groomer now. Get references from other yorkie owners as a small breed dog is its own category. Many vets offer puppy packages that include check ups, fecal exams, vaccinations etc...
Finding a vet that is familiar with small breeds will enable your pup to be effectively and safely treated.
Other costs include X pens, which you should look for now also. Many times you can find them on sale or clearance. I have been collecting for Suri for over a year and she has more than enough.