They should not smell of urine or excreta. They ought to come up to you eagerly as you go down on your haunches. When you pick one it should be happy and friendly and lick your face, not be as quiet as a mouse and looking anxious. You should be given the opportunity to see the whole litter, but if you know what sex you want then the members of the other sex and any to be retained by the breeder should be taken away so you know you are looking at potential puppies of the sex you want and not being confused by pups you can not have. Prices vary by location, being dearer in the South than in the North.
Some breeders price each pup separately, and others charge the same price for everything.
Generally one could expect to pay less for a long coat but not always so. Be cautious about astronomical prices on an 8 week old puppy. Some breeders ask for a deposit which would not be refundable if you cancelled. Others may not, but if you are going to cancel, have the grace to tell the breeder. So on the day you go to buy take cash.