Female or male? Is this person well known and respected in the breed? What are thier usual terms? Just because someone shows does not mean they have good dogs, have healthy dogs or know what they are doing. Be careful. I know of a couple of people locally that have really bad dogs but they finish them eventually. They think they have wonderful dogs but they look nothing like anyone else's. And they think they know everything also. Everyone else just ignores them. they think it is because we are jealous. NOT. I wouldn't touch thier dogs with a ten foot pole

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Research the breeder very carefully.
Is it a male? who gets stud services? Who decides who the dog is bred to?
is it a female? does the breeder get puppies back? if so, how many? and out of how many litters? Who decides on the stud? Who pays for the breeding? Who pays shipping? Who pays stud fee? Who pays health testing? Who pays for the vet care for the pups? Who pays csection fee? When does the breeder take her puppies? Who decides who gets what puppies.
Lots of things to consider and have it all in writing.