Wow!! First I want to thank everyone for the really positive response and already alot of useful ideas/comments, sooooooo much better than reddit,I think I am in love (with the Permies forum)
I guess i will try to answer/respond to some of the comments questions here.
I have a fair amount of experience with ruminants but none with ducks per se, I have played with them at my mates and I just love them from what I have seen. They are indeed dirty little buggers but that is in part ok because dirty water = good fertilizer and also I am planning on a fairly large pond (all relative i guess but something like 2ft deep by 20ft long and maybe 15ft wide... ish) so 2-4 ducks wont much it up at least on a daily basis (famous last words?)
I am planning on collecting quite a bit of water, not only for the pond, and it seems that a buried modular milkcrate and liner setup would be cheap and flexible enough to provide for the pond and my other needs, I liked the idea of overflow for the tank directly into the pond, thanks!
For fish, Koi are pretty but as someone said they are carp and I am not a huge fan of carp for eating, trout would be awesome but i dont think they like still water, catfish maybe? Tilapia would be great but i think where i am gets too cold in the winter (close to freezing occasionally, but not often) and I dont know how id keep the water (passively) warm enough.
For the layout of my yard, I am a horrible artist, and doing it with a mouse didnt help but this is approximately what i am working with https://sketch.io/render/sk-994d085502250286e4633a14ab9ff556.jpeg
I am hoping to minimize the "effort" to keep it up so asides from a pump to suck the water out i am hoping to avoid too much in the way of gizmos, and I am not sure I would have many plants in there, any thoughts on plants that fish and ducks actually *wouldnt* like?
My yard is on a bit of a hill but from one side to the other i doubt its more than say 5-6tf so not much, but the roof would certainly be higher than the pond, and the pond higher than about half of the yard.
I cant wait to start this, though it will likely be a few months, i posted here to brain storm and try to learn a bit in advance. Thanks again to all and I look forward to more interesting posts and responses!