How does one go about..

…Establishing a new breed of dog?
Say i got, for arguments sake, a Labrador/German Shepherd cross, and bred it with another Lab/Shep cross that looked similar, and kept breeding through several generations until the offspring were all coming out pretty similar. What next? As far as establishing a pedigree and all that jazz?

Are you in the United States? From the American Kennel Club:

I imagine it would be similar in the U.K. and other countries with large dog breed organizations.

The Shiloh Shepherd is in that process right now- it’s going to be a great breed.