As I suspected! Chicken people! Thank you folks.
There are tons of people doing this and posting about it online, so there is much to be learned from the internets. I think this article references 4 sq. ft. of coop space and 10 sq. ft. of run space per adult bird.
https://www.backyardchickens.com/articles/how-much-room-do-chickens-need.66180/
I've built all my coops and runs, but I see nice ones for sale all the time. Whatever fits your time and budget. Adult chickens are pretty self-sufficient. They need food, clean water, and protection from predators. If you don't have a coop, they will roost in trees and lay eggs on the ground. But I recommend a coop.
It may be possible to train them, but when you let them "free range" as we often do, they tend to wander in search of bugs and other stuff to eat. If you live on a busy street, have a small yard, or if you're pretty sure your neighbors won't appreciate them, you may need to be a chicken herder. They will come home to roost at dusk.
Hens can make a fair amount of noise at times, not least when they're pushing out a particularly large egg, but it's not that loud and it's not frequent.
At their peak, they may lay one egg per bird per day, but it will never exceed that, and it will often be less. Unless you supplement with artificial light, they will lay much less in the winter. Egg production is linked to hours of daylight, and they need 12-14 hours for optimal production.
Breeds differ with regard to cold-hardiness. Biggest thing is to keep them out of the wind. If your coop is pretty tight and full of birds, they will be fine. I've only ever lost one bird that I think froze, and it was after a period of warm weather in March, followed by a very cold snap. Since then, if I know it's going to be very cold (in central VA, that's anything in the single digits) I use a very small electric heater in the coop. Many will tell you that no heater is necessary.
Different breeds are favored as egg-layers and others for meat. I'm after eggs. I've been very happy with our Ameraucana/Leghorn crosses, Buff Orpingtons, and Barred Rocks. The Black Australorp we had was aggressive toward the other hens, so I won't be getting any more of those.
Good luck. Honestly, depending perhaps on where you live, keeping the birds safe from predators may be your biggest challenge. It seems that almost everyone likes the taste of chicken. Read and heed advice regarding building a run. It's no fun going out one morning to discover that some ferocious small mammal has dug under your fence and wrecked two of your best layers. Other than that, adult birds require very little attention and we enjoy having them around.