Not sure when they will lay...mine is now interested in the nest boxes, but that's about it. ( I'm not sure how old she is) As far as keeping them happy, mine is a spoiled lap chicken, very people oriented.
Needs lots of chicken toys ....ie. garden weeds to scratch in ...things to keep her occupied, like small logs in the run and space. She plays well with others and has been the flock "big sister". I would say she is ALPHA, but benevolant. We did have a bit of feather picking, but that stopped the minute we enlarged the run. She is one of the smartest chickens we have, hence the need to be kept busy.