Welcome to BYC. Set your goals, study the forums, ask questions, plan/prepare, and you will be successful in establishing/maintaining your flock. Build far bigger than you think you will ever need.
You might stop by our Learning Center for all kinds of good reading on all the aspects of keeping chickens, building the coop and other goodies... https://www.backyardchickens.com/articles/
Scan around the forums and ask as many questions as needed. Welcome aboard!