I can only tell you what I do, I'm not a groomer but do have 3 yorkies.
1. I bath them once a week -- I use Mane & Tail Shampoo
2. I use Cowboy Magic Conditioner
3. I use Cowboy Magic Detangler & Shine enhancer
4. I try a brush them each every day -- I use a massaging rubber brush, a natural boar bristle brush and a metal comb.
Cowboy Magic Products can be purchased usually at a feed/farm store or
www.cowboymagic.com The Mane & Tail is available at Walmart
Hope this helps.