Please pick a puppy you can see everything, do not fly puppy in over internet pictures. Everything in writing, no verbal promises. It is difficult not to fall in love fast with their cute little faces.
Hope you Pick a Yorkie, you will never go back to another breed. Just like kids they all have their own personalities, energy, playful, etc.
Consider your life style, as Yorkies are not happy in kennels most the day or left at home. Really want to be with you all the time. I could go on and on, just wish you the best, take your time and you will find your furbaby.