You've come to a great place to learn about your new baby. Yorkie Talk is great!
How old is your baby? I'm just asking because people tend to think that because you have a really tiny dog in size that you've gotten it from a breeder way too soon, and that is not always the case. My daughter got a tiny yorkie at Christmas that was actually over 12 weeks old. Some yorkies are 'just tiny'....and after all..."
somebody" has got to love and give a home to the little ones too...right?? lol!
Either way, with a new little one you should first and foremost get them totally vet checked....make sure they are eating well and often. I don't like to feed mine wet (canned food), because it makes their stool too soft and messy and they seem to have more stomach issues with it. But if that is all that yours will eat at this point, then stick with it until you can gradually switch them over to a good quality dry food...one that is small bites for small breed dogs.
If for some reason your baby is not eating well at any point or has any stomach issues, my vet recommended plain yogurt and it worked wonders with my Callie who was very finicky and had some of those issues when we first bought her home. You really do have to be careful with the hypoglycemia especially in tiny puppies. It can creep up on them so fast. Feed them often,...and I always kept corn syrup (like Karo) on hand or sweetend water in case we ever had that happen. Get it in their mouth via your fingertips, dropper, rub it on their gums...whatever you have to do. Hypoglycemia can be fatal. Research and learn all you can about it.
Be especially careful with your new baby as far as putting him/her up on the couch/bed with you. Yorkies are VERY brave and they WILL jump! I've read countless stories about Yorkie puppies who have jumped from high places and ended up with broken legs.
Another thing about Yorkies that is different from some other puppies is the grooming. It is recommended that you brush your Yorkie daily. With a new puppy, (or at least with Callie when she was a pup)...I discovered that she had what was called "a puppy coat" underneath all that fur. Even though Yorkies don't shed, which is wonderful.., they DO shed that one-time puppy coat. So brushing your puppy daily will help get rid of all that "fuzz" underneath and let her coat breathe and keep her skin under there healthy. There are all kinds of combs and brushes out there, especially designed for their coats, that ppl recommend. Some are way more expensive than others. My baby's coat hasn't gotten that long yet so tangles and matting hasn't been an issue. I am still using the little cheap comb and brush I got at W'mart and but I plan on investing in some better ones very soon. Through the advice of my best friend, I learned that cornstarch works wonders with tangles and matts! Just rub a little into the fur that's matted and it will start to separate!
I don't know what your plans are for potty training, I chose puppy pads because I work during the week and there was just no way I was leaving my baby in a crate for that long. Crate training is wonderful I'm told and definitely worth looking into if it will work for your arrangement. There are lots of other methods too like bell training for instance. With any of these, consistency is the key. I will say that Yorkies are stubborn and it has been my experience that they are a little harder to train than other breeds I've had in the past.
The most important thing of all that I can tell you is this: Of ALL the dogs I've had and loved over the years, (I'm 43 and I've had many~)...this little Yorkie has truly stolen my heart.

I've never had a dog with such personality and such sweetness. I am so in love with my Callie Lou Sugar Bug!~

Enjoy the new love of YOUR life!