Hope I don't come off as a know it all overkill LOL but here's my 10 cents hope it can help you! Congratulations read read read!
1.
Kennel at night now and don't stop dog's don't have tears unless they have an eye infection or just give it up all together - ignore the whining its called training.
2. 8 weeks is too young it does matter
12 weeks is a minimum
3. "
Teacup" size implies
irresponsible breeding for a smaller sized Yorkie-USUALLY
4. Really? Potty trained at 8 weeks-is that a record?
5. Get chew toys, don't allow mouthing or biting of people or items period.
6.
Go to the vet, for a health check and do all the testing possible better now to know before you have symptoms later and don't know...trust me!
7. The best way to maintain health is by proper food-if we are what we eat, well dogs are amplified by 100x in that literally the food they eat has almost as much an effect ton their health as any genetic predispositions.
I feed Taste of the Wild, I used to feed Innova before I went grainless. I only give
Zuke's Mini Naturals for treats
8. Before you even ask-
harness not collar
9. Microchip your baby
10. Get your baby fixed/altered/spayed/neutered!
Here's some links for some products I love at really cheap prices-wish I had found them so cheap before I bought them!
Dog Car Safety Restraint Seat Belt Harness 7-15" Chest - eBay (item 350373860862 end time Jan-09-11 18:01:03 PST) 
Amazon.com: Best Pet Folding Play Pen - M -... 4" White Pet Feeder - The Bella Cottage http://cgi.ebay.com/New-Chrome-Metal...item3cb38f74e5
I prefer this kind and later a Flexi comfort grip for small dogs
http://cgi.ebay.com/FLEXI-Soft-Grip-...item2ea9e91aae Petstages - Developmental Toys for Dogs
The rag rope ball is our favorite from the 100lbs American Staff to the Yorkie!
Zukes Mini Naturals – Dog Training Treats, The Perfect Training Treat for Dogs
Perfectly formulated for the small dog!
Home Taste of the Wild : Home Innova Natural Dog Food, Cat Food & Healthy Dog Treats – Natura Pet Products YorkieTalk.com - Yorkshire Terrier Community