It can take quite a long time to research the correct ways of breeding, proper care, having money ready for vet bills (which is highly likely with pet shop hamsters, it is an expensive hobby, don't expect any profit), having all equipment ready and your mind ready for the good (and the bad that happens with breeding). You will also need to research genetics to be able to identify and correctly pair hamsters together, some pairings can cause issues (like eyeless white pups with the Wh gene). Please read
This Thread and maybe reassess if you feel you are ready for breeding just yet. I am aware there are breeders in the US. I know Strong Brew Hamstery has knowledge on breeders in the US so maybe give them a message. It's also highly important, even after all your research, to have a mentor. They can help direct you and help you asses progress and help with any issues that arise. A mentor must be someone who experienced with breeding. They must be a reputable and responsible breeder so you can breed the correct way.