I am trying to buy some muscovy ducks. First try failed.

Second try happening after x-mas.
I'm trying to purchase 2 female and one male. That wont be to few females will it?
Really depends on the drake.. some boys are nicer to their ladies than others are
Are their eggs easy to incubate? Or is it better to have them under a broody hen or broody duck?
I hatch out muscovys every year in the incubator.. I think muscovys are much easier to incubate than most people claim. Usually people have the humidity too high and end up with ducklings that die in the shell just before hatch. Letting mom muscovy hatch them out is easiest for most people... you CAN let a broody chicken hatch them.. but be prepared with an incubator on standby since chickens incubate eggs for about 21 days.. and muscovys take longer (33 to 37 days). So some broody hens will get tired and quit; leaving the nest before incubation is complete. If you catch the nest in time the eggs can be moved to an incubator to finish up incubation artificially.
Can they fly? If so how tall of fence will i need for their free range time?
I pinion the wings on ducklings when they are a day or two old. (Pinioning is removing the wing tip).. I only pinion one wing. Even with a pinioned wing I still have a drake that can clear a 4 foot fence. If you decide to clip wings on a older bird only clip the flight feathers on ONE wing. Don't try to pinion an older bird.. even though it can be done, they will lose too much blood and it's too painful.
I heard males can get 20 lbs, is that true?
Males can get large.. but I think 20 pounds is pushing it a bit.. I think my largest drakes run around 15 to 17 pounds give or take.
I was thinking of hatching some from what I get and using males as food for my dogs (butchered and all that wont feed live I'm not cruel), and then sell female ducklings. How much are they worth? I don't want to over pay for them either.
I don't feed muscovy meat to the dogs.. that's meat we keep for ourselves (it's more of a red meat.. closer to nice veal than to poultry). Muscovys here sell for between $ 15 and 25 for goslings (unsexed). Sexed adults go for around 25. I havent checked the prices at the sale lately.. but that's what they were selling for on ads at the feedstore.
Any info you can give me will be great especially if it's first hand experience. I've read a lot online but different sites have different info about them. Some controdicts. So now I'd rather hear from people that own this breed of duck.
Lol.. they are actually "perching water fowl" They can be cross bred with "ducks" but you will end up with a sterile "mule" (unlike crossing a mallard with a pekin where the offspring would be fertile). So it's akin to crossing a donkey or a zebra with a horse.
Will they be okay being with my chickens or will i need to build a second pen?
The chickens will most likely end up attacking the muscovys eventually (unless they are all free ranging). You could be lucky and they will all get along. But in my experience the chickens ended up being the aggressors
Are they friendly?
It depends on how they are raised. If handled alot as ducklings they will be more friendly than if you turn them out and don't touch them. My drakes will chase the dog.. but don't dare attack me if I get too close to one of the nests
do they prefer deep or shallow swimming areas?
Mine occasionally use a wading pool. They do not like the water as much as the cayugas, mallards or pekins.