The deep litter method is different than just deep bedding. The idea behind the deep litter method is to frequently turn the bedding over, leaving all the poo in the litter to sort of compost itself. Feasibly you can go 6 to 12 months without cleaning the coop. The good bacteria is supposed to...
Concrete is hard on their legs and feet to stand on. But any sort of bedding like wood mulch, grass hay, even wood shavings will keep them off the concrete. If they need a dust bathing area, you can create areas like this with an old tractor tire filled with soil, even a huge round planting...
Hello there and welcome to BYC! :frow
Great suggestions from @DobieLover Also, 5 square feet per bird in the coop. 1/2 to 1 square foot of vent space in the eaves. Never close them all off no matter how cold it gets. Chickens produce a ton of moisture and it needs to vent off to prevent frost...