Sir, since you say you're a newbie, maybe this will help you out. Rule of thumb for space requirements: in an enclosed coop, each bird typically needs four square feet of unencumbered floor space. In a run, plan for ten square feet per bird. Hope this helps!
I am not sure a chicken wire bottom is needed. They will need to scratch and peck the grass they will be on all day. A wire bottom will be very hard on their feet and prevent them from accessing the grass. Would others please chime in on this?