Welcome to the brink of Duckdom!
First, may I offer the stickie, 101 Reasons We Love Ducks
Next, from my limited experience and from reading a number of posts here on the Duck Forum, ponds are not needed for ducks (though some seem to feel that ducks are needed for ponds), and in fact may be dangerous places, depending on the pond.
Ponds attract all kinds of predators, and ducks are just as susceptible, if not more, to predation. Snapping turtles as well as land mammals attracted to the water can injure or kill ducks.
That said, if your pond is really well protected and does not have snapping turtles, your ducks might do well during the day. They would still need a very secure place for nighttime, and you'd need to figure out how to get them into that secure place before sundown.
It can be done, but it needs to be done.
I love ducks. My runners are happy with mud puddles and kiddie pools.
Domestic ducks, many of them, cannot fly, so being out in the open they are potential targets. I have read a couple of stories the last few weeks of hawk attacks.
From here, perhaps you can think about (and share if you'd like) what you'd like from the ducks. Eggs? Pest control? Beauty? Low maintenance? And then see which breeds match up with your wants and preferred level of management.
Enjoy the journey!