I got good hatches with a mini advance and quail ring, that little incubator is ideal for quail. But I would strongly advise you to wait a few weeks to hatch, though - the incubation period is only 16 days for quail so you'd be responsible for chicks round about Christmas. They take a lot of looking after in the cold, even indoors. They do a lot of very smelly poo and make a lot of feather dust, not really what you want in the house for several weeks. I hatched my first lot in late February and even then it took a lot of time and care adjusting the heat lamp up and down over their box because the house got a lot colder overnight. My second hatch, in April, was a lot easier to manage and they went out into cages in the well-lit summer house at about 4 weeks old, and then into a rabbit run on grass soon after. Baby quail chicks are about the size of bumblebees so lose heat fast and need a really steady temperature, and like chicken chicks, they also benefit from proper sunlight when they become 4-6 weeks old, which you can't give them until at least April out of doors. Also at this time of year, the parent birds are not so likely to be in full breeding condition with high fertility levels, so quite a few eggs in your hatch may infertile, or the chicks won't be as strong as they would be from healthier and more vigorous parent birds in Spring.
Quails come into lay so fast, at 6-10 weeks old, if they're hatched at the right time of year, (between March and August) that it seems to me to be a bit silly to try to do it for several weeks yet, if you want an easy hatch of healthy young birds. As you're finding out with the ones you've already got, they are unlikely to lay unless there's enough natural sunlight and warmth. Chicks hatched in December probably won't lay any sooner than ones hatched several weeks later, when all the wild birds are beginning to find mates and nesting. They're not like chickens, they don't come into lay at a predetermined age, they are much more influenced by the seasons and the possibility of conditions being OK for reproduction, even though they don't usually make a nest or sit on their eggs. It really is best to stick with their natural rhythms, I think.
My advice would be, for what it's worth, to take time to get used to the ones you have, get them laying, and then see how you feel about hatching. If your friends want you to hatch for them, they'll just have to wait - or hatch their own! In any case you might not have any spares from your own first hatch, since more than half of them will turn out to be males, in my experience.