MOST breeders are "pet dog breeders". labs are super super popular so lots of breeders are just breeding "pets". they don't show nor buy from show breeders. they don't compete in field or hunt nor buy from hunting/field lines. they just breed a cute lab to another cute lab and then sell puppies. this has lead to most labs you see out and about being all over the map as far as looks (height, weight, lenght) but also some variations in temperment. I have met tons of labs with completely non-lab temperment lately.
Note that ALL breeder produce companion dogs. Even champion dogs from champion parents won't produce a litter of champions. They hope there is a keeper or two that may "turn out well" (in field or in conformation). the rest are perfectly wonderful family dogs.
I am currently searching for a breeder. I look at dogs I like (and randomly find) and then look if they do all clearances and compete (in conformation but I also want drive/workability so looking at more than just "does well in conformation"). Specifically I am looking for smaller lines (I call it a more "moderate" look). But then beyond that I have a long list of requirements I want in a breeder (which will make my search difficult haha). My personal issue is I find the field dogs too pointy and the conformation labs too big - so I look for that magical middle zone
Look at your local (or as local as possible) breed club, go to shows and meet some dogs, it's the best way to start. Or if you are more intresting in the hunting aspect, look up your local hunting/retriever group and participate/volunteer.
Note that the lab should actually have a wide/big head as per the standard
Maybe this is the club closests to you? I am not good with american geography so maybe someone else can point you to another club galrc.com | GALRC