Yes, you can treat them like chickens pretty much, except:
1. Ducks won't use roosts.
2. Their nests have to be on the ground, not elevated.
3. They need a pool of some sort, but it doesn't have to be super big.
4. If you feed them chicken feed, you may run into problems because ducks need more niacin in their diet than what is offered in chicken feed. I don't have to do this myself, so I'm not quite sure what is the best way to feed them niacin.
Ducks are a lot messier, also.
I can't think of any other major differences right now. If there are any others I missed, someone else can probably tell you.