First of all...as a novice owner/breeder you would have no idea if an 8 week old puppy will be just like your girl at 11 months of age. They all have different temperaments, personalities, energy levels, drives, ect.
Second of all...they'd get half their genes from the sire, so the likelihood of them being exactly like your girl is very small. Since you don't work your girl, and haven't proven her to be breedworthy, you're likely to not get a very good sire to stud to, and you'll end up with a pet quality stud. Since neither you nor the owner of the stud probably know that much about genetics and pedigrees you have no idea what to expect out of a breeding.
Third of all...are you seriously considering the fact that you'd try to keep 6-10 GSD puppies? Pretty much just sounds like raising a pack of wild wolves. You think you'd be able to train that many dogs at the same time? Run that many dogs at the same time? Do anything with that many dogs?
I know you think your girl is amazing...we all think our dogs are amazing. But she's only 11 months old, she hasn't even matured yet. You have no idea what her temperament will be like in a year, or two when she's going to be fully matured. It's just not the right time to make any kinds of decisions on whether or not you should be breeding her.