Welcome! You will love it here. SOO much information especially for a new yorkie owner. It has helped me greatly. Mostly to realize that my little boy's behavior is completely normal and to re-affirm that I am doing a good job with him. My little man, Tobey is almost 5 months old. I think that I am not going to do bows because I think it will make him look like a girl. that's just my own issue though. to each his own.. I Do however want my next pup to be a girl so she can wear a pink sparkle collar and pretty bows in her hair.
As for the nipping, replacing your hand with a toy works at first. mine is still struggling with it and at first saying no or uh ah! worked well but then he started ignoring me so we've been spraying him with water which has worked amazingly well. he learned to stop in a matter of days. Good luck!!