I am going to suggest that you wait. Roosters with pullets are often times rough on the pullets, can run them ragged. And roosters take a lot of experience. Not all roosters will work out. Your pullet eggs will not be big enough to have a good hatching rate, so you don't need a rooster right away. I would wait until your girls are grown up and laying well, then add a rooster.
Your current birds are not full grown, so how they will work in your set up, is really yet to be seen. Just because they are getting along well right now, is no guarantee that they will continue to do so. While there are measurements that can help, they are no guarantee, a lot depends on your birds, and shape of your set up. Waiting till they are full grown can really help you see how well this is working.
You will gain invaluable experience in the mean time. Then either this fall or next spring, order one more set of chicks, get a straight run. You will get rooster chicks, you will have mature hens, and you can raise those chicks right up in the flock. Roosters raised this way, in a flock of mature hens often times (no guarantees) much better manners and are much better with chicken society. Just getting one rooster, and hoping and praying that he will turn out to be a good rooster, does not often work.
This will let you have a couple of roosters to pick from, it will allow you to thin your flock to your best layers. If you do this in the spring, you can cheat on your space a bit, and by fall, you can thin your flock to fit your set up.
Flocks really are not a static perfect number as in 8 hens and one rooster. Flocks grow and decrease in numbers throughout the year, I keep a flock, but the birds in the flock come and go. I want to have the smallest flock going into winter, and the largest flock going into summer.
Mrs K
