Start by looking at the YTCA website. There is a breeder referral section there. You should also become familiar with laws pertaing to the sale of puppies in your state, as well as the lemon laws. You are very lucky to live in FL, as they have some of the strongest laws covering puppies.
Look at this stickie for more info:
http://www.yorkietalk.com/forums/bre...e-breeder.html
Above all, take your time and do your research. Avoid offers of puppies by private messages here. There are far too many backyard breeders who lurk on YT trying to sell dogs that, while cute, are no where near standard nor bred for health.
Good luck.