Where can you get an SOP?You don't need to be in a group to show.
I've seen Runners shown both in a large, open cage and also in a regular cage, but I THINK (correct me if I'm wrong) before they are judged they are put into the large, open pen so the judge can see their movement - something they are judged on that other breeds are not.
IMHO, I would go to a couple shows before attempting to show something. Hang out in the section where your breed is, be a sponge. Learn from what you hear, take notes, meet folks who seem to be like-minded to you, ask where they'll be showing next, etc. You'll quickly learn what to expect this way.
I've never shown ducks, but I have shown chickens, and (also IMHO) it's important to respect the judges by making sure that your bird is conditioned and cleaned up (no mites, no dirty feet, vents, or beaks, etc.). Also, GET AN SOP. Study it, keep it on hand and compare your birds to the SOP - take the very best of what you have. And - have fun!
I've been looking up my breeds standards and it refers to this and I've been trying to hunt one down to buy one. Do they sell them in feed shops? Or is it strictly online?