First off, forget the free ranging. Yes, you can free range, but only once!! You will never see them again. Clipped wings or not. An enclose area is great for Bobwhites as they will love the freedom. Some folks keep them in pens or cages, I prefer the aviary setting on a litter floor. I have a giant brush pile in the center for them to not only hide from things they think are after them, but from each other. This way they have a natural setting. However I have found over the years that you should cover the lower half of the fencing so they cannot see out all around. They get stressed and don't feel secure. I allow them one area only to see out and have posts set up all along the inside so they can hop up to see out. They just love to use them.
Come breeding season, which is late spring to early fall, you will need to separate all pairs as they will fight and can kill each other. Even the females will go after each other. Then in the fall they can all be released together again to covey up for winter.
Quail don't eat much. So it really doesn't cost much to feed them. But their housing must be extremely well built as they are huge targets for night time predation. Use the strongest of materials available and don't assume nothing can get at your quail. Over build. And then over build again. Then add more.
Gamebird food is the way to go. I have tried mixing my own, but it is not cost effective and the quail can suffer for it. They need a LOT of protein, especially the girls during egg laying season. I also allow them bird seeds and offer corn in the winter to stoke their inner furnaces. For some of my more finicky eaters, I mix in chicken chick starter with the gamebird food to get them to eat more gamebird food. (That does work).
I don't know of any really good books on keeping quail, however the internet is a great place to start. Many websites can tell you a ton of stuff about all sorts of things on quail.
I hope this all helps.
