Hi and welcome to YT. So sorry for the lost of your dog. Hopefully your new baby will help heal your heart.
I would check out
Yorkshire Terrier Club of America Yorkshire Terrier Club of America. They have a wealth if information as well as a list of breeders in your area.
You are very wise to do your research before getting your yorkie. There is a lot to learn and prepare for. Doing your homework now will no doubt help you find the right baby for you. Good luck.