
You are unlikely to find a reputable breeder willing to sell you a puppy knowing that you plan to have two at the same time, especially of the oppposite sex, in case of accidental/irresponsible breeding!
Why do you want two pups? Also pups of opposite sex will be hard to manage when the bitch is in season, as one or other will need to be securely confined away from the others. this will be upsetting for them, as two pups brought up together will be more attached to each other than to you!
If you are looking for two companions, I would sugest you have at least 3 years age gap, and have a same sex pair or have one or both neutered.
One way of doingthis is to first obtain an adult rescue, and after you are happy with your relationship, and the dog has had six months or so to settle with you, then you could purchase a puppy as a companion, and have the enjoyment of puppy rearing, with experience of owning the breed already. :D