I would go and buy the book Storey's guide to raising ducks. lots of great info in there about the breeds your interested in and housing and pred control and diseases.
your talking big ducks with Rouens to med ducks with the other 2 breeds so you need at least 6 sq'per duck inside their house outside run needs to be 10sq ' here is one thread about houses.
https://www.backyardchickens.com/t/55358/duck-houses now bear in mind the more secure you build the safer and longer you'll have your ducks, some pics on this thread don't look safe to me but you can get some ideas on what you want but try not to think of cost, think of it as investing in the safety of the ducks you will have in your charge. Free range is fine as long as you don't have roaming dogs, which are the #1 killer of back yard waterfowl and other poultry. I free range when I
can be outside spending time with my flock, other wise they are contained in fencing. On days in winter when temps get int upper 30's I try to put out water in cement mixing tubs for mine to bathe in, but most of the winter they have their heated buckets to wash their faces in. They don't need to bathe but always seem to enjoy a bath in winter.