RE: stud fee
In answer to your question: Stud fees can vary from Free to $4000 (yes, four THOUSAND) or more. But first, you have to ask yourself some questions. What does this breeding offer as to improving the breed? If a dog doesn't have any titles (Field Trial or Hunt Test) and there are few or no titles (such as FC, NFC, AFC, CNFC, MH etc etc) in the first 3 to 5 generations in the pedigree, the dog would have little or no value as a stud (the same holds true for the female). Just because a dog DOESN'T have titles itself, does not necessarily mean that the dog isn't a good dog -- it just means that with titles, you have the proof, and proof = $.
In general, stud fee will be equal to the selling price of one pup from the litter. So in a litter where the pups would sell for $100, that would be the stud fee. If the pups would sell for $3000, that would be the stud fee. If your Lab points, you can add another $150 to $300 on top of that.
As BLKLAB said, there are other things that come into the picture as far as genetic health. Both dogs in a breeding need to have had their hips (and preferably elbows too) OFA'd (PENN hip is also acceptable) CERF(done within one year each time the dog is bred) on their eyes. The female needs to have been tested for Brucellosis within 30 days of the breeding.
OFA certification only needs to be done once in a dog's life (after they turn 24 months old), but CERF is only good for one year. Getting these certifications isn't cheap, so if you have a dog that is worth a $200 stud fee, you are going to lose money right off the bat. OFA X-Rays for hips and elbows will be between $200 and $300. OFA registration will be about $50 for both. A CERF exam plus CERF registration will be $50 to $70 and a Brucellosis test on the female is only a few bucks.
An example: My dog has a great pedigree (11 big time titles in the first 3 generations), and he himself has his MHR, WR and SR titles. He passed the PacNW Regional Invitational Field Test at just under 2-1/2 years of age.
He is OFA good on his hips, OFA normal on his elbows and he has recently CERFd clear. He is also a natural pointer, but even at that, he is only worth $500 to $700 for stud fee (depending on the qualifications of the female). Unless a highly qualified female would come along, I wouldn't even consider breeding him.
To be done properly, there's a lot more to breeding than just putting a couple dogs together.