Questions to ask when choosing a puppy

Well my last staffy I had I got off a childhood friend and my mum asked the questions etc while I played with my new puppy (I wanted a female and she was the only female so no need to choose) but tbh I've made a few mistakes in the past with other dogs I've attempted to rescue resulting in them being re-homed again (not proud of that but have to keep my daughter safe)

So my question is what are all the questions I should ask the breeder ?
What should I look for to say they have been brought up well and will settle in with a young child well?

What are the things I should just say NO to and walk away please

A useful link for you below:

http://staffy-bull-terrier.com/how_to_choose_a_puppy_from_a_litter

And another:

http://staffy-bull-terrier.com/basics_for_new_puppy_owners

Make sure you always see the parents! I can't stress how important this is, it gives you the best indication of what your pup may grow up to be like in temperament and size. Its also a good idea to ask about any health concerns the parents may have/had in the past.

Agree with fay_elizabeth, certainly see the puppies with their mother and find out as much as possible about the father ( I phoned the owner of Toot's sire and asked loads of questions)
Make sure the place is clean where the puppies are kept and make sure the parents have been health tested.
If something causes you concern, walk away