Normally when introducing new chickens, I would put them in a small run (or large crate) for a day or two with food, water, and bedding inside (or very near if it’s a small run) the normal chicken run or coop. This allows the old chickens to see and talk to the new chicken and get used to them.
Epsom salt with lavender will probably help to calm the quail a bit. To sterilize, I would use iodine or blucoat. I would probably use vet wrap? I don’t really know. I’ve just used bandages.