It's important for puppies to learn to control their bites.  This is best taught at a young age.

Carefully watch your puppy for signs that he is about to grab your hand. Before he can do that, give him a soft toy or a Kong as an alternative.

If puppy bites you before you can give him a toy, make the squealing sound a littermate would make when it is bitten by another pup – "eek" or "ouch". Then quickly redirect the puppy to an appropriate toy that is "chew safe". 

When a puppy can't be supervised he should be safely in his crate or an exercise pen with Kongs or other dog-safe toys that can't be chewed up and swallowed.  DO NOT LEAVE STUFFED TOYS IN A CRATE WITH A PUPPY.  Talk with your breeder and/or vet about safe toys for puppies.

Also, a tired puppy is a good puppy. Be sure your puppy gets plenty of exercise for his body and his brain (but a 1-mile walk or more is WAAAAAAAY too much until the joints knit).  Exercise for 10 minutes every hour or so is better than 2 hours at a time.  Puppies need naps just like babies.

Start training at an early age in a good puppy class in your area.  Puppies of all breeds get your puppy used to other types of dogs.

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Based on information supplied by The German Shepherd Dog Club Of America by Cheryl May,