If there isn't a lot of availability, you may actually have a good chance of them paying for themselves. Making a profit is a lot more iffy, but I know I'm happy if they pay for themselves.
She might well beat up on the babies. I wouldn't put a hen in with the babies that wasn't at least 18 months old, and then I'd watch her very, very carefully to make sure she wasn't aggressive with them. Quail can be violent little creatures.
Are there any signs of the gender on the other...
Orange and white look like grau fee to me. You definitely don't want three males together when there are any females around. It will get bloody fast, quite possibly lethal.
FYI, if I sold those to you, I would have told you if I was uncertain of gender, and would offer to exchange the extra males for females. I guarantee that you get what you pay for. You should see if the person you bought these from will do the same.
It really depends on where you are. Check your local feed stores, local classifieds, FB groups, and craigslist to see if any are available already, how much they're selling for, and if they're not, how much interest there is.
I had some decent profit back when I was in SuperExpensiveLand (The...
I would watch it and worry if it grows. Otherwise, I would expect it to heal. If you are concerned you could apply some ati-bacterial ointment, but make sure it's one that doesn't have pain killers. Most of the pain killers used in those are toxic for birds.
So, a request was made for pics of my new orchid plants. I got these for free, and we'll see if I can keep them blooming and get them to bloom again. The kind of sad one on the right is one I've had for about three years.