Gun, shells, waders, decoys, learn how to duck call or bring somebody who can call, boat (for the most part) or 4-wheeler. But you can't duck hunt with a 4-wheeler at only select places. So if you can get all that and a place to go you will be set.
Or the other alternative is find someone who is willing to take you til you figure it out. But even then you will need the right clothes which may include waders, gun, and shells. But that would be the easiest way to give it a shot. But its hunting dont go out there and expect to kill ducks.....there is a lot of hard work that goes into killing ducks.