Congratulations on your new flock! If you haven't been to the Learning Center yet, check out some of the great articles there, they'll help you out on a wide number of things: https://www.backyardchickens.com/atype/1/Learning_Center
Glad you could join the flock! What a fabulous coop, very nice indeed Thats some lovely breeds you have there, you could post some pics of your unknown one in the what breed gender section ~https://www.backyardchickens.com/f/15/what-breed-or-gender-is-this I'm sure members there will be more than happy to help you ID your bird.
Wishing you the very best of luck for the future. Be sure to ask any questions that you may have, everyone here to help and very friendly.