Welcome to YT
And on grooming your Yorkie check out this section
Yorkie Grooming Talk - YorkieTalk.com Forums - Yorkshire Terrier Community
Lots of suggestions on brushes etc in there. I love my Madan brushes and combs, some prefer other brands, so read the grooming section and check out messages on brushes there.
One thing I will say is do not buy one of those pin brushes from the stores. The brushes that have the little balls on the ends of the pins. They are not good for a Yorkie's hair.