Where NOT to get a bulldog puppy
Most people don't realize they're getting from some of the worst places possible. The top three to avoid like the plague: puppy brokers, pet stores and random online listings.
Puppy brokers advertise puppies they didn't produce. They're one of the most dangerous, because a lot of the time they look like real breeders. Pet stores usually buy the same way, often from even worse sources, and have no information on the parents or the bloodline. And anyone can post a puppy online.
What you want is a real breeder: someone who does it for the love of the dog, takes care of the dogs, and has multiple generations to show you. They can show you the parents and the relatives, they understand the pros and cons of their line, and they've bred properly to improve it.
That person should know more than you about everything to do with the breed, answer every question willingly and happily, offer you a tour, FaceTime you, and be as transparent as possible. And they should give you support for your dog's whole life.