The biggest thing anyone can do that is looking for a pet or for a breeding Biewer is to do research, research, research. Do not be hasty! Since this is a fairly new breed in the US you will find a lot of pretty words but you need to talk to people and do a lot of looking at different websites.
Good Luck with finding your perfect Biewer as they are a wonderful Breed.
You might want to also go and look at the sister website to Yorkie Talk which is Biewertalk.com so you can learn a little more. Not as active but many different breeders are on this site.
Best wishes.