[matese]

Congratulations on your new puppy.
Yes, YT has a wealth of info. on the yorkie breed. I happy to know you are benefiting from it.
It's really hard to say which dog food is best for any dog. Dogs like humans have their likes and dislikes.
Yorkies are known to be picky eaters so that is going to be a hit and miss adventure finding a good quality food that your dog will eat.
As for supplements and vitamins, your vet should be able to provide that for you or at lease provide with with information on what to look for.
I buy my supplements with vitamins directly from my vet and sprinkle it over his food. Your vet is the best person to advise you on supplements and vitamins. As the saying goes, one size does not fit everyone, same goes with for our fur babies.