We are new to chickens and we got 7 on Friday. We were looking for 12 but will pick up the rest on Wednesday. 6 white leghorns and 1 golden comet (getting 5 more comets). We got these for eggs only. Will they still lay ok even without a rooster. I have heard both ways on this. We live in central Wi. and we have on old barn, would that be warm enough in the winter? And I was told to keep the food and water outside so you don't get mice and rats inside. We are planning on free ranging.