Hi, I joined this site today. I’ve had my two backyard chickens for 3+ years and I want to add two or three more chickens. Based on these pics, can anyone please recommend breeds and age of chickens to buy? I have a relatively large and adequately shaded urban backyard of about 7,000 sq feet in Houston, and a large coop but I let the chickens roam 24/7 and they use the coop when they want. Thanks!