Hello and welcome to BYC!
Nice to meet you.
You need 4 sq ft of floor space, 1 linear ft of roost space and as close to 1 sq ft of permanently open ventilation per bird in the coop and 15 sq ft of space per bird in the run.

You need 4 sq ft of floor space, 1 linear ft of roost space and as close to 1 sq ft of permanently open ventilation per bird in the coop and 15 sq ft of space per bird in the run.