Hi and welcome to BYC. Here are some helpful links:
Great go-to resource - Articles
http://www.backyardchickens.com/t/788391/keeping-chickens-cool-in-summer-heat
https://www.backyardchickens.com/threads/topic-of-the-week-keeping-chickens-cool-in-summer.1181934/
Space requirements
How to start...