OOO it's gonna be alot of fun...the peeing, pooping...you gotta love it all! I think the puppy class is a good idea. You want to socialize your dog as much as possible. Also, you want to expose her to alot of new things. If she's not housetrained...make sure you have alot of vinigar! LOL...I think that you should bring her to a obedience class afterwards...but in the meantime, you can start with her if you'd like. I started with Kai right away..so by the time we went to obedience..there really wasn't a purpose for us to go...he knew everything already but the socialization was needed.
I also think you should establish that you are the leader at this stage...from the moment I got Kai, I made it clear that I was boss. It's best they learn now rather than when she's older...and ALOT bigger. Anyways, congrats on the GSD! I just love that breed!