Welcome to BYC!
Just remember that what seems like "plenty of time" to worry about construction of the coop and run can become surprisingly insufficient as chicks quickly outgrow the brooder while, at the same time, distracting you and taking up valuable building time that is better spent admiring their cuteness.
What kind of climate do you live in? This will help with breed suggestions to go along with your desire for light bodied, friendly birds who are good producers.