I forgot to refer you to the grooming forum. You can read the stickies at the top of that forum and look through some of the threads to decide what grooming equipment you will need. A good pin brush without balls on the end, a good metal comb to remove mats, a good quality puppy shampoo, and I use tearless baby shampoo on her face near her eyes, a good heat-adjustable blow dryer, nail clippers. These are just a few items. I use a couple of different size grooming shears and good quality scissors for trimming hair.
http://www.yorkietalk.com/forums/yorkie-grooming-talk/