It's great that you got ducks! Have you had chicks before? From what I've heard they eat and live like chicks, only wetter.
I tried ducks this year for the first time. We put the ducklings in with the chicks. Maybe we didn't have a big enough box or something, but anyway, they were A MESS! I had to clean out the sawdust twice a day AT LEAST. The first time they soaked the bedding I didn't notice untill it was to late and one of the chicks got so wet he/she froze. Rest in peace, Charlie.
Needless to say, we got rid of our ducks after 2 weeks.
I don't want to give you a bad opinion of ducks. Our ducklings were very sweet, and I'm sure they would have been great pets, but they just weren't for us.
But don't worry, you have BYC on your side, an advantage I didn't have at the time. There are enough duck experts on here to blow your mind with advice, besides, you are probably better prepared than we were. Good luck.