First of all....welcome to YT!! You have received the best advice already from some very knowledgeable people so I have no further advice to give other than enjoy your little pup. I had had two yorkies...one I received at 8 weeks from a neighbor who thought it would be nice to have her dog have puppies and another at 12 weeks from a breeder. The major difference was that my first yorkie (8 week old boy) was very nervous and a little nipper
if he wasn't familiar with you. He was on the large side when he was given to me and was large all his life (12 lbs). But he lived a very healthy happy life till he passed at age 9 1/2. My Trixie is a little over a year old and is much more secure and so far...no nipping. This could just be personality or it could be 4 additional weeks with her mom and littermates teaching her proper etiquette.
Best of luck to you on the adoption of your newest furbaby. They are just wonderful to live with!!