I agree: set up your coop first.
Some things to consider with whatever coop you get:
1. Ventilation: Fresh air is essential all year round. You can use just about anything for a coop, just make sure it has good air flow.
2. Winter Conditions: Plan your coop for the severity of the Winter to...
Like others, I use leaves, grass clippings, and pine needles. I also use a composting floor. Clean up is just sweeping the poop/dirty bedding onto the coop floor and turning it over (which the chickens help do by scratching). Also makes a great additive for garden compost. Let Nature do the...
I bring tap-hot water out to my birds daily (no electricity in the coop). Since this is my first year wintering chickens, I had the same concern. But if the chickens are behaving normally and still laying eggs, I've judged the situation as "all good."
And my birds are behaving normally and...
Four birds total. Averaging two eggs daily.
Today Hi 16.5 F, Lo -2.2 F. Got two good looking eggs from RI Red and Ameracauna.
After the coldest night of winter so far (-3.5 F) I had three eggs waiting for me in the morning. From the same two birds plus a Sussex.
How many eggs were you getting daily before now?
I've noticed the number of eggs ebb and flow with my 4 birds. Averaging 2 eggs daily, but sometimes 3, other times 0. However, all my birds are still laying regularly throughout the week which has reassured me they're doing fine in the cold.
I noticed a few scabs on my RI Red and thought frostbite too. Did a Google search ("chickens frostbite") and found a ton of photos to compare. Now fairly confident it's not frostbite: scabs are on the flat of the comb (not tip), no expansion. Seems the scabs are actually from another bird...
This is my first year wintering 4 chickens and I had the same concerns. Based on my experience so far, I totally agree with what most others have said: no additional heat (or light) needed, keep your birds dry and draft-free, keep them well fed and hydrated. I've been averaging two eggs a day...