Just a couple of things to add:
- If you’re going to take the advice to restrict them to the coop for a couple of weeks (and it is good advice), make sure they’ve got plenty of room for their size. They can do with a smaller coop if they’re out all day, but if you (or the weather) will be keeping them cooped up, they need more room. Otherwise they can start bickering and picking at one another (just like people only with fewer inhibitions).
- If the coop is small, it becomes more important to let them out promptly in the morning for the same reason.
- The first couple of times you put them to bed in the evening, you may need to do some chasing. I did, and my babies had been in the coop for a few weeks. A long-handled fishing net would have been nice to have on hand. Treats in the coop and possibly leading up to the door can make things easier.
- If you have reason to worry about the cold (for example if this is their first introduction to anything below 70 degrees Fahrenheit or chances of colder temps than expected), you could use an outdoor extension cord and put in a brooder heat source. If it’s a heat lamp, just be very, very careful to secure it well and place it so it can’t get close to anything combustible. If that’s not feasible, they’ll most likely do fine cuddling.

Chickens aren’t hard to please. TBH, they’re likely afraid of the outside. Anything new really sets them off. Mine stayed inside their first one for a week with the door wide open all day before I managed to coax them out. I had put them in at five days old so it was pretty much all they knew. It’s a great little coop for babies or maybe half a dozen hens. Was described as appropriate for 12. By someone in TX. Even in Texas that might be a stretch, but definitely not in SD.
Somehow the inevitability of winter confinements didn’t even occur to me! (sigh)
Can’t take them back inside. Everything that could hold them is too small. The tractor is big for them which at the moment isn’t a good thing. Soon, though, it will be small for them. I tarped it all over save a couple high vents and hung brooder lamps. Chickens are tough. Way tougher than I am! I’m buying ground anchors and more bulldog clips and two more heat lamps today... ridiculous, this weather we’re having. I should have thought of this, but we are always learning. Here they are on a rare sunny day: