I agree, when you know nothing about it, you shouldn't be doing it.
are you having all these dogs tested for STD's, brucellosis, hips & eyes certified? brucellosis causes them to abort or causes dead births or deformed puppies
why would you just let her breed to anything? any idea how many mixed GSD's are killed in shelters every week because there are no homes for them?
will you know if she is in trouble & can you afford a c-section? can you afford the vet care for the mother & puppies? I have no idea why you want her puppies but you certainly aren't going to make any money on them & will most likely have to take them to a shelter where they will most likely be killed.
I want you to read the information I am providing:
So you want to be a breeder?
Things to think about BEFORE breeding your dog
Get her spayed ASAP & the others neutered