First, find a good German Shepherd book on the breed. Make sure it is a book that has depth so the history of the breed is in it. Some of the better breed books are by Willis, Hart, Strickland/Moses, Lanting, Goldbrecker, and Von Stephanitz.( I own them all) you really only need one at first and read the dang thing.
Second, go to American and German conformation shows,(you can also see obedience, rally, and sometimes agility at some of these shows), go to a or some Sch/IPO trials. Also, see if you can see some police and search & rescue dogs.
Talk to people at these places and observe their dogs, engage these people in dialogue about where their dogs came from and what they do with their dogs.
If you do things this way you will save yourself a lot of heartache. Why???
Because by having read the book, you will have baseline knowledge of what the breed is. What it should look like and how it should act. There are NO personal types of GS. As you visit the different venues you will be to see which ones resonate with what you have read what the breed should be. You will not be taken in by a lot of the BS that many breeders sell to justify what they breed. I can't tell you where you will find good representatives of the breed, but if you read one of those books you will be much better equipped to appreciate the real deal.
If you do the above things and stay true to what you have learned about the breed, you should be able to have a good feel for the breed.