Like you I am new to keeping chickens. Mine came with my house because the sellers couldn't take them. I live in Colo where it can be cold and snowy. My hens are Rocks. They have done fine through the past 2 winters. That breed is known to be docile, but since I have nothing to compare them to I can't speak to that. When I'm bringing them treats the bossiest one will peck at my hands, but she's doing that out of greediness and not aggression. I let them free range in my yard for a few hours in the morning and they forage the whole time they're out, but I can't tell how effective they are. There are mice in the coop and everyone tells me chickens will kill mice, but not my pacifist chickens. I have a 6-foot fence to deter predators. After an introductory period, my own dogs and cats are fine with the chickens being loose in the yard. During the introductory period there were some chickens vs. mammals battles which the chickens won every time thanks to their secret weapon -- flapping wings.