I have to agree with the previous post - the best info I have found is here on YT for free. I got one of those breed books from the pet supply store and most of it was common sense if you know even a little about the breed like: *smaller dogs are generally more difficult to potty train than larger dogs *yorkies need grooming often and coat care can be a lot of work if you want to grow it long and keep it show quality *very small puppies have special caloric needs or they can risk low blood sugar, etc...
I read the book cover to cover when I got it and then never referenced it again. YT is way better.
If you're into tangible media though I recommend a subscription to Bark magazine or Whole Dog Journal.