Welcome: Go 3-4 times bigger with your coop than you think you need. Go 5-6 times bigger with your run than you think you need. Cover every wall and ceiling with hardware cloth and make a hardware cloth apron around your coop and run. You will solve 80% of issues with chickens if you do these things.
Hi Kimberly, welcome to BYC. I'm glad you finally talked your husband into getting chickens! There is a wealth of information on BYC regarding coop and run construction, as well as an entire article section devoted to coops. Below is a link to the Coop and Run Forum. You should be able to find answers to all your questions here. https://www.backyardchickens.com/forums/coop-run-design-construction-maintenance.9/