I recommend putting this in the "General Breed Discussions and FAC" forum, but great question! I recently did showmanship with New Hampshires. Just tell the judge facts about the breed; egg production, meat production, history, size, development, when accepted by APA (American Poultry Association), etc. Get a Standard of Perfection copy, online or physical. It will help a lot; Orpingtons are in the English class (good thing to know for judging). Check out BYC Orpington threads, my Pet Chicken, and other sites that give info on them. Know different varieties, and which ones are accepted by APA. If it's teh same as my show, the judge will also ask about parts of the bird, memorize feathers and where different parts are (pope's nose is where the tail feathers protrude out of the body, that's what stumped me this year, but still got Grand Champion in my category, and Reserve Champion overall). Basically, just learn different things about the breed, and chickens in general.