Hi! Welcome and Congrats on your new addition.
You have truly found the best website for Yorkie information right there... look around, there is so much information... basically anything you could possibly want to know.
Glad you found out about harnesses,
they really are the best thing for these little ones.
I like skineez (they are a toy with no stuffing inside!), my guys also like pretty much anything from petstages, they like these small rubber balls I get that squeak, Dr. Noys Kong toys (they are little tiny stuffies with a squeaker).
Finding a good quality food is important.
You are beyond all the puppy shots... but in the future, it is important to limit the amount of shots these little ones get at the same time because they can have a reaction to so many... my rule of thumb is that mine can only have one at a time.
It is important to make sure your vet is versed in small dogs because they have extra concerns when going under anesthesia and you want to make sure your vet will understand all of these issues.
Thats all I can think of at the moment... I know others will chime in also.!