OP, please ignore recommendations of Sheerfire. They are NOT a reputable breeder of Staffs.
The Staffordshire Bull Terrier UK Club will have a list of recommended, reputable breeders. Your first port of call should be them. I'd advise you to go to some dog shows, watch them in the ring, see which type appeal to you, talk to owners and handlers, narrow down a list of breeders of the type you like.
Ensure the breeder does all the relevant health tests on both dam and sire. Puppies should be KC registered, chipped, wormed, flea treated and come with a contract that includes full endorsements and a return to breeder clause.
Be prepared to wait. Please, please don't buy a dog from anyone who advertises online. Reputable breeders do not advertise their puppies.
You're at an ideal time to get yourself to Crufts in March. Not only could you get to see the Staffs in action and speak to Staff owners, but you can visit Discover Dogs where they will be able to talk to you about reputable breeders and you can meet Staffs there, and probably be licked to death too ☺️