Hello, I am a new member, living in Boise, Idaho. I'm planning on getting some chickens beginning of next year and we're already in the process of building a coop. I think the breeds I want are an Australorp, Rhode Island Red, Barred Plymouth Rock, and Easter Egger. I'm not completely sure yet if I want to get chicks or pullets. I'm leaning towards chicks, but obviously I want to be sure that I can get females. At what age can they usually tell for sure? Or is it better to just go with pullets? Thanks!