That's like asking someone to tell you everything about chickens. It's impossible in just one post
Ducks are _not_ like raising chickens. Ducklings play in their water. A lot. They splash it all out and dabble around and make a huge mess. Then they start crying about how they have no water an hour later. When you check on them your jaw drops and - again - you have a mess to clean up.
I've had a lot of success with keeping ducklings on a plain rabbit water bottle to keep them from driving me up a wall with cleaning. They should still get a dish from time to time to clean out the bill, but nothing that stays in the brooder for more than a few minutes.
They get along with chickens without a problem. Drakes are...ah...not very selective when it comes to who they charm. Make sure you keep at least two ladies to every male and make sure none of the males decide to get some action from your chickens on the side.
You mix ducks and chickens together by having a chicken waterer that ducks can't get into or splash/dabble around in. Otherwise you'll be watering your chickens every few hours in a muddy mess that the ducks keep digging holes in with their bills because nature thought it'd be a good idea to make them into miniature bulldozers.
Female ducks are loud. I'm convinced they are screaming "Hey you! Fox! Hawk! I'm right here! That's right! HERE! What are you waiting for? Scared? Just try to come eat me!"
They scream that a lot. Some breeds are louder than others. If rooster crowing bothers you a lady duck may get on your nerves, as well. Drakes have a quiet, "Donald Duck" rasp that is nowhere near loud.
Ducks also tend to be skittish. Most duck breeds remind me of flighty Leghorns. There are exceptions to the rule, and if you work with them a _lot_ then you can keep them mellow. Otherwise their natural instincts kick in and remind them that they are small, defenseless, tasty birds with virtually no stamina when it comes to running away.
When ducklings are young you need to feed them a NONmedicated feed. Preferably one made for waterfowl or gamebirds with a high protein. When they get older they can eat egg pellets with your chickens. They also appreciate dog or cat food, slugs, and other bugs from the garden.
Duck eggs are great. They are a little rubbery and do have a somewhat stronger flavor, but there is nothing better to bake with. Duck eggs are one of the great secrets of professional chefs.
Runners and Khaki Campbells tend to lay a ton of eggs, but are seem to be more skittish than other breeds. Pekins are more laid back, but the ladies are _very_ chatty. Rouens are pretty mellow for a duck and don't seem to make a lot of noise. I kinda like Welsh Harlequins (real ones from a real breeder - not the speckly things you get from hatcheries) and Cayugas. They're dual-purpose breeds and Cayugas have the added benefit of laying dark grey/black eggs at the begginning of the season and tapering off to a light grey egg by the end of the year. Those are just nifty to have around
My absolute favorite is only a half-duck - or at least isn't related to any of the other domestic ducks out there. Muscovies are quiet, laid back, don't dabble or quack. You just have to get over their sometimes crazy faces.
I definitely recommend getting some ducks. Make sure you hear the good and the bad before doing so. After that it's worth a try. You'll probably end up being smitten with them - even after all the bad things I had to say
