One thing I haven't seen mentioned is regarding checking into state requirements for selling eggs. Seems like everyplace is different. Some states (i've heard) require a license to sell any eggs, while other states are more lenient. You could begin by calling your Agricultural extension agent (look under your county government to begin the search) and they can likely tell you what you need to do or whom to contact.
Do you live in or near a metropolitan area? Is there a gourmet market, a specialty market, an asian market? All these *might* be interested in quail eggs, but you should be ready to explain your legal ability to sell eggs (and your inspection status if that is required) before approaching them. Also, you should feel comfortable with your supply and how many you would have available.
We have begun raising quail. Once the weather warms up they are going to be evicted from our garage attached to the house, to the outbuilding - our yard is less than an acre, so a quick trip from house to outbuilding. We do not like the smell that creeps into our house from the quail. Right now, with them in our garage, we have an appliance box (opened up at the seam) providing a great wind shield for when we open our garage, but a shower curtain or wood shield could work well too. They are cold hardy - but they need to be out of the wind. Im in west central OH and we can get to -15F on winter nights, with some very breezy conditions. Quail have done well so far.
We recently butchered half of the babies we hatched in early Dec. We cooked them last night and they were tasty (more of a dark meat and kind of sweet - our 11yo thought it was interesting that the meat was kind of sweet). Can't speak to the butchering process as my spouse completed it while I was out one day, but he approached it by removing the skin rather than plucking the birds - they slip right out of their skins and spouse likened it to butchering doves - similar process.
Good Luck.
