You can start simple training right now. Is she housebroken yet? If not, first work on that! Formal classes need to wait until she has had all her shots, but you can work on simple things like house training, and teaching her what a leash is (and that it's not a chew toy) now!

Oh, how fun! As a German Shepherd she is probably very smart, so lots of toys to chew on and things to keep her busy are a good idea. Hide the shoes!!!!

Why not get a book from the library for now? As a first-timer, you'll have a lot to learn, but a lot of fun learning it. Simple things I know:

Never hit her.
Don't scold her for something she did half an hour before. If you don't catch her "in the act," she won't have any clue why you're upset!
Love her,
Love her,
and love her!

Oh, congratulations! What's her name?