Buy your breeder first...I love that! Much wisdom, new Yorkie buddy!
I will begin an earnest search in Sept., when I return home (FL) from NJ,
where my son is getting married (he is the only one I love more than my Yorkie

).
Right now, it's research, then research some more. I have a breeders' list - at least one - from The YTCA (did I get that right?) or AKC website. I saw 2 breeders recommended by this site as well. I've spent a lot of time looking at rescue sites, too.
No hurry, really, except I'm all worked up now, dizzy in the midst of a Yorkie "high"!

Oh, yes, almost forgot those little-tongue kisses full of sweet puppy breath!