Have you looked into the different breeds at all? How much space have you got? Do you want large ducks or miniature? Good layers? Meaty? Domestic or wildfowl? etc. I think this website
http://www.ashtonwaterfowl.net/ has a good overview of many of the domestic rare breeds. If you want to show, find a breed you love the look of, find a local breeder and go and visit them to get top tips and find out how to get great breeding stock.
I keep two duck breeds:
Silver Appleyard - I chose this one first because I think they're lovely looking and they're a dual purpose breed so they're brilliant layers, rarely broody and meaty enough for good eating.
Cayugas - These are stunning ducks - black all over but with a green/sometimes purplish sheen in the sun. Not such good layers (and mine have yet to start - I hatched them last summer) but OK and also good eaters. I chose them mostly because of their looks.
I do have a lone Aylesbury too but I wouldn't breed them - she's a little less agile than the others, the keel just seems to weigh her down a bit. I also have a yearning over Blue Swedish but more because we used to live in Sweden. I might get some hatching eggs in this year but not for breeding purposes, just to have them join the flock.
But each to their own and I think you have to look at breed pictures and see what you like the look of. I don't show but I imagine the most important thing is just that you become an expert in whichever breed it is so that you can select your best stock.
They don't spend any time inside in the day (except when I clean them out and then they have to go and investigate) but it's best to have a shed or house of some sort to keep them safe at night. They don't perch (except Muscovies?
- don't know anything about them) so they just need a deep layer of bedding on the floor. Decent sized door - I think they'd struggle with a chicken sized pop-hole - and good ventilation. Mine get Waterfowl finishers/growers when not in lay and Waterfowl breeders starting soon.
Chris Ashton (who website I linked to above) has written some brilliant books on keeping ducks so if you're keen to find out more, get hold of one of them.