There are many ways. I have a 8ft by 3ft above ground pen that will house 24-25 birds. If I may offer a word of advice the best thing to do is get a book on raising and breeding gamebirds...and also join a gamebird forum. Thats So Quail Place is a great forum.
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Click the link in my sig, follow the links to the pheasant page - there are images for nearly every species (same for most quail and other wild galliformes). Sam gave some good advice with checking out a book - check out authors Delacour, Johnsgard, Madge, etc. Also listed on each of the pheasant pages. You will see that size and aviary type does vary for each species.
jumbo coturnix is the biggest
button quail is the smallest
i made a cardboard brooder they work fine
then just make a small chicken coop with atleast 1 inch wire