A proper PP dog will have been bred for that specific purpose. They usually come from bloodlines that have proven their worth in the field of PP. It is highly unlikely that a GSD with no pedigree and from a BYB will make a proper PP dog.
Just enjoy your puppy and start working on obedience. What you don't want to do is rile the dog up and turn it into a fear agressive dog, which timid puppies can become. Socialize your pup well, get it used to many different environments and other dogs and invest in solid obedience training.
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MacKenzie - Workling Line Female (In Loving Memory)
Wolfram - West German Showline Male [SG1, CGC, DDN, CN, EN, IN, VN]
Bash - Working Line Puppy