They're ground birds and don't need a roost, though i've found mine (i have button quail) do like to stand on top of tall flat things like cardboard boxes so that they can look around.
If you're getting Coturnix quail the males and females have distinctive color differences for most of the color morphs, though the white ones have to be vent-sexed or you can just watch and see who crows. There's another coturnix thread that shows pictures of the genders in various colors for reference.
Males can become territorial so if you have more than one male you might have to separate them eventually, but they often get along okay. Offering more space and several hides, like cardboard boxes with doors cut in the side, will reduce the chances of territorial fights.
I personally found that purchasing pre-hatched chicks was a better way to get the gender ratio i wanted, but hatching is a very rewarding process if you don't care as much. Chicks can be raised in a brooder until 3 weeks, and given a heat lamp until they get all of their adult feathers (about 6 weeks).
They LOVE dust bathing. You can give them a pie plate full of clean sand and they'll spend all day rolling around together. It's extremely adorable.
You can feed just high-protein game bird feed (as above, 24-28% protein), or you can mix two parts feed with one part high-quality finch or quail seed to enrich their diet. Calcium is very important, and they'll need crushed oyster shell available at all times.
They also like treats such as kale, broccoli, carrot, apple, sprouted birdseed, clover, timothy hay, and live bugs. You can give them mealworms, but not more than six worms per bird per day or they'll get fat. They'll also appreciate a hard boiled egg every now and then.
I give mine a variety of foods because i've found it results in tastier eggs. And their eggs are small but super delicious.
Corturnix start laying at about 8 weeks and will lay every day as long as they're warm and get 14 hours of light per day. If you don't want to provide artificial light through winter, they probably won't lay until spring but they'll be a little older and a bit stronger so you won't be as at risk for calcium deficiency or egg binding.
They're extremely rewarding and fun birds, and i hope you get as much joy from raising them as i have!