Some good advice already given to you.
Firstly, I’d do some research on the breed. What genetic health problems does it have? Which ones can be tested for? A responsible breeder will have had the bitch health tested and go ahead with breeding only if the health test results indicate she is suitable. The stud dog should also have been tested of course. Some breeders will choose a stud dog that’s been tested but not go to the expense and trouble of testing their bitch. Obviously this gives only partial protection to the puppies so should be avoided.
Ask to see the health test certificates which any good breeder will be happy to show you.
Find out how often the bitch has had puppies. No more than 3 times is recommended but 2 is better. She shouldn’t have pups until she’s 2 years, preferably 3 years and not over the age of 6 years.
Bitch and pups should be in the house, very clean, and very well cared for. At 2 weeks their eyes will still be closed but they should look plump and healthy. The breeder should tell you about how the pups will be socialised when they’re older, what food they’ll be eating, when they’ll be wormed. They shouldn’t go to their new homes until they’re 8-10 weeks old.
The breeder should be welcoming but also grill you on your home situation. We had 4 litters of puppies over a 10 year period and were very picky. The breeder should want to know if someone is at home most of the time and if there’s an enclosed, easily accessible, garden. The family needs to have time for the puppy also.
A responsible breeder will have a contract for you to sign, expect you to keep in touch throughout the lifetime of the dog, and take back the dog if you can no longer keep it. Our contract stipulated that we could visit their home without warning and take back the puppy at any time. Regular Skype/phone calls should be expected especially during the first few weeks.
You should receive a pedigree, KC registration document, chip registration when you collect the pup.
Cost of the pup should be discussed but not be the main topic. The pups’ welfare should come first.
Go along to see the pups but be ready to say no if there’s any problem.
There are unfortunately some breeders who will not be absolutely truthful with you, so double-check any information they give. They may well be members of their local breed club and if they are, the breed club should know they have pups. A call to the breed club can give useful information.
Please PM if you’d like any more info. Good luck.