Totaly New to Dogs and I Realy Need Help

 GSDs are herders and depending on their prey drive, you could have some dead or injured livestock.

Spend the money on at least a couple of in-home sessions with a trainer. An untrained German Shepherd with access to chickens, ducks, sheep, and goats? Let your imagination run wild!

The puppy is displaying territorial behavior already? That's early. Make that trainer a certified behaviorist. You may be misreading some other behavior. Either way, you don't want Cujo patrolling your farm when the mailman comes up the driveway. A behaviorist can help you read your dog and let you know if there are any issues you need to really work on.

I read everything I can get my hands on. Behavior. Theory. Training methods. Body language. Books, TV shows, Web sites, message boards, you name it. There can't be a method or theory I couldn't at least summarize by now, but all that knowledge has been worth zero to me without hands-on experience. I've made a lot of mistakes that could have been easily avoided if I'd spent a couple of hundred on in-home consultations from the beginning.

Get someone out there with you. You'll thank yourself later.

Honestly if I were getting a GSD for that line of work I would have gotten a puppy (so it could be raised with livestock) and been *really* selective about the lines and the breeder.  This is more the type of work for a livestock guardian dog like a Great Pyrenees.  GSDs are herders, they help move livestock and mainly create a "fence" by circling the flock.  For the true HGH dogs in Germany, they are trained in protection but this is increasingly rare, especially in the US.  It would be difficult to find a dog from such lines that have proven themselves in this type of work.  You'd probably have better luck finding some farmers that breed non-pedigreed dogs for this type of farm work.  Also Fenris is right, the GSD often possesses a very high level of prey drive which is most often not suited for small animals.  Even when herding and tending the flocks there are shepherds (people) present.

 Guard dog? My vote: Bullmastiff. Personal bias