Take my advice, do NOT brood chicks and ducks together. The ducks need water deep enough to put their whole face and head into it, for starters. Ducks are messy, wet and nasty brooders and will trample chicks and soak them down. You can get by for a while for 3 in a 50 qt storage tub and clean it frequently. You could also use a rabbit cage and make sure you empty it every couple of days. In a month you should be able to move them outside providing we don't get that crazy late winter garbage creeping into May. They won't need as much heat after a few days as chicks do either. You are really biting off a good lesson as a beginner, aren't you? LOLWondering what is the best way to introduce my chicks and ducks with each other.
I have 7 (4 BR, 3 BYM) chicks who are all together in their brooder, 3 ducks (1 Pekin, 2 Khaki Cambells) who have been in their brooder next to the chicks for a week and a half. The BR chicks are 3-4 weeks, the BYM are 2-3 weeks, ducks are 3 weeks old. The Pekin has taken on the role of lead duck and the Khaki's hang back to see what happens to the Pekin before trying anything. I have noticed one of the BYM seems to be in the top of the pecking order for the chicks...she even tells the roo's what to do. (I like her.)
We have 10 new 3 day old duckies (not sure on breeds yet...did a mixed run). I know they have to stay away from the other ducks for awhile yet.
I plan on the ducks and chicks having their own coops/runs, but I will allow for them to free range together and I don't want them to get into tiff's.
When the new ducks are older, I plan on keeping them with the older ducks.
You will also want to consider letting the two species have their own separate areas with that many. Ducks can be brutal on chickens. Ducks will try to mate with ANYthing (Hey Ralphie, maybe you need a couple of ducks for Bert of the ladies of the chicken persuasion don't work out), and that means other drakes if there are no ducks around.
Good luck. It sounds like you have your hands full!