I do not know much specifically about selling quail eggs. In IL, a "small flock" owner may sell eggs from his/her home without much issue. (Small flock is a big number - like over 100 birds!) I believe the idea is that the customer could always look over the fence to see the condition of the flock. If you want to bring eggs to sell at a farmer's market or small store, restaurant, etc, then you would need an egg license. (Must grade, candle, wash, weigh, & refrigerate eggs. Then use only NEW egg cartons. There's probably also a fee and inspections to deal with.) I find that there are so many people willing to buy eggs, that I must turn most away.
I never did figure out what to do with my glut of quail eggs. If a customer wanted, I just slipped 2 quail eggs in exchange for a chicken egg. However, my kids ate most of the little eggs. They enjoyed the popularity in the lunchroom. LOL Our quail stopped laying for the year. We ate a few birds, but I really wish I could tell genders before making those decisions...
More than once, people made comments about how they never knew that chickens came in such pretty colors. 
How else do you think I can spread my orpington addiction around the Chicagoland area? My lav orps have also gone to homes in WI, MI, IA, IN, WI, MO, & MN.
.. I have that brood locked up still in the bachelor coop... a hen and ten 8wk chicks are not happy in a 8x8 coop... the rest of the flock has been out and no issues... I may let the brood out Sunday ... Maybe lucky will be wanting to go out by then.. She is not wanting out of the dog crate yet.
