Bravo for you, and welcome!
There are a variety of ways duck folks have done all this, so please don't feel confused. What works for one may not work for the next person.
I strongly recommend you invest in Storey's Guide to Raising Ducks, and keep up here on the forum. I have a small flock - pets - 9 Runners, 4 Buffs. One of the Buffs is a drake. So far, so good! They are all about five years old, and delightful.
Since we are such a small operation, I find that two concrete mixing pans, sometimes three, are perfect. I can dump, rinse, and refill quickly (I am not a big person). They poop in their water, so having a drinking pot is more or less for my own sanity. However - it saves water because I can dump, rinse and refill the water pots more often than I need to do that for the swim water.
Speaking of water, many duck newbies have no way to know how important water management is until the little beauties make a swamp of the brooder, which becomes aromatic and unhealthy.
Here are some solutions to consider. Remember, they are waterfowl. One might be tempted to reduce their access to water to solve the problem. One would be mistaken, because then there will be an increased risk of eye, ear, and sinus infections. And ducks are happier when they have water to play in. Happy ducks are healthier ducks, in my experience.
So.
https://www.backyardchickens.com/t/641902/created-a-water-saver-for-my-duck-brooder
https://www.backyardchickens.com/t/679433/water-water-everywhere/10
https://www.backyardchickens.com/t/858161/feed-water-solution-for-brooder#post_12901321
http://frankiemakes.blogspot.ca/2012/06/watering-solution-for-ducks.html
https://www.backyardchickens.com/t/259876/do-your-ducks-have-water-at-night/10#post_13568197
post number 8 from this
https://www.backyardchickens.com/t/959603/ducklings-getting-stuck-on-their-backs#post_14939819
Storey's Guide has a table of feeding recommendations so you can get an estimate of their food needs. At the same time, each duck, each flock is different, and weather and other factors can affect their eating. So be prepared to be flexible. You'll need to monitor their body condition, especially with such a large bunch - I am a small bunch person, so I have the luxury of paying close attention to a small number. But Storey's is written mostly for people in your situation.
We see stories here of many ducklings with niacin deficiency. Regardless of what the feed guy says, ducklings need more niacin than is in chick starter. And while many ducklings apparently show little outward signs of it, I am convinced that they very well may have internal problems that are related to the deficiency.
Also I suspect many duckling deaths are attributed to a "mystery," when it was poor nutrition.
And to head that off, I would start with perhaps 100 mg of plain (plain, plain, plain, not no-flush, not timed-release, this is a big point of confusion) niacin per gallon of drinking water for their first 8 weeks. Or if you prefer, and I think I would go with this, a tablespoon of brewer's yeast per cup or two of their feed daily. Please read up on this and come up with your own approach. edit to add - brewer's yeast, not baking yeast, not winemaking yeast, not anything active - brewer's yeast is a nutritional supplement.
And by the way, for some reason, many feed stores do not carry these items… I suspect they will eventually. (end of edit)
I do room service daily - spot pick poops, fluff bedding with a cultivator. Replace dry bedding as needed.
To avoid water problems, have a separate area for watering. I keep water and food available 24/7. But with a watering station and food area, cleanup is quick and easy and that preserves most of the bedding.