The problem here is that no domestic ducks should be released onto that pond, at all. There's not a good breed for it. Mallards can fly, but since you'll be raising them yourself from ducklings they will not be learning survival skills to live in the wild, which wild ducklings learn from their mother. They won't know how to find food, which is something I have not seen mentioned in your posts. Who's feeding these ducks? Are they supposed to feeding themselves? Because they will have a hard time with that on their own, especially in the winter. Domestic ducks can't fly away for the winter like wild ducks do, so any non flighted breed put on that pond will starve over the winter. If the pond freezes over, they'll have nowhere to go and they'll be easy food for hungry winter predators. Mallards can fly away, but they probably won't come back in the spring and as was mentioned they'll be subject to duck hunters.
If you really love your ducks, find them a new home, and don't get any others to put on that pond unless the neighbor is going to be providing feed, shelter, and protection from predators for them. And by feed I don't mean tossing some bread once in a while, I mean leaving out a specially made duck feed that they can have access to 24/7.
Otherwise do what Amiga recommended and try to attract wild ducks. That's going to be your best bet and is the best thing if you guys just want to see waterfowl on the pond without having to do any feeding or other care that human raised ducks require.
