You don't need a big spread for a small pond if you're looking at 3 or less acre ponds, I would just throw about half a dozen to a dozen. Make sure that the wind is at your back as ducks prefer to land into the wind. As far as type, just throw in a group of mallard then toss a few woodies a few yards apart from the rest. For smaller areas you don't really need an elaborate set up. In fact, we hunted a few small ponds, we would gang tie about 5 or 6 deeks together just throw them in and we did just fine.