I created a simple divider for in the coop made of chicken wire and a wood frame (but the frame isn't all the way around so I can fold it up for another day), I choose to make everyone share the same waterer so there is a gap in my divider to fit a big waterer but no one can sneak through. During the day, I put the rooster in the kennel with his own food and water, the ladies can come and go from the coop to the run, if they are comfortable and not stressed, they will approach him and investigate him through the kennel, they need to get use to him.
Make sure the kennel is big enough for him to walk around a little, I'm not a fan of cages for chickens but some people are okay with it.