Welcome from Kentucky! 6-8...to even 12 chickens would not need a very large coop. Size of coop would depend on whether they would be staying in there all day, or if they would be let out and only sleep/lay in the coop... If they were kept in a coop, I would allow them to have some room to move around some...I'm lucky to have the space to let our chickens roam free, and am partial to letting them have as much space as they would like. If they do have an opportunity to roam, you could get by with a smaller coop...say 5x5 ish, just enough space for perches and laying boxes.