No one expects a six month old puppy to be "professional". I have shown in AKC competition (non-GSD) for seventeen years and have had puppies wiggle and kiss the judge, roll over, jump up, etc. The big thing with puppies is to make sure that you are not so nervous that you, the owner/handler, make it an unpleasant experience for the puppy. Have fun and take it easy so that you both enjoy the experience.
Everyone else has given you good advice as well. Contact your puppy's breeder, take conformation handling classes and go to shows as a spectator first. Showing can get expensive very quickly and the AKC rings can be a very cut-throat environment. They can also be a wonderful place to learn about many things "dog".
Sabra - female GSD - born April 30, 2012
Sargeant - rescued senior GSD male/foster failure - approximately ten years old (August 2013)
Max - rescued GSD - Dec 22, 2010 to March 7, 2012 - at the bridge
Sable - rescued GSD - at the bridge