J.F.
I'm not against breeding but I encourage you to strongely reconsider. There are so many unwanted pets out there as there is. Have you seen an animal shelter recently? They are overwelmed and speaking from personal experience, I know that most of these animals are pure breed. You also need to think about WHY you want to breed? Is it for the betterment of the breed? Does your dog have champion blood lines? Could his offspring go on to better the breed as well? A good breeder is willing to rescue dogs from their breed and take in any dogs from their offspring that become unwanted pets. Are you willing to make that commitment? I'm not trying to tell you what to do or only give critism, honestly. I'm just not sure you're aware of what you're getting yourself into, mostly because you don't state much in your request. There are many great resources out there if you are truly serious but I too reccomend reading them before jumping into breeding. (although I'm sure your lab is saying c'mon mom, just ONCE! ;)) If you have any questions, feel free to contact me. I hope I didn't offend you or turn you off of ever rescuing, as that is definitely not my intent. Good luck with whatever you decide.
J.