when can i expect eggs?
Having a laying box or two built is a good thing. BTW, you'll only need one box for every 4 or 5 birds because they prefer to use just a few. It's a social thing. But, there's no rush in giving access of the boxes to the pullets. Wait until the last week or two. Young birds just are too tempted to sleep in them, and thus poop in them, making a mess.