Opportunity is missed by most people because it is dressed in overalls and looks like work. - Thomas Edison
We had chickens last year. The most important thing is a racoon proof pen. It has to have a top and a bottom. Also the chickens need to be locked in at night. I won't even to begin to tell you the stories, just make sure the pen and coop are well built. As far as the feed, be careful feeding them all table scraps and juicings. They need to have a certain amount of regular feed for the suplements and also crushed abalone shell. Without the crushed shell, the egg shells are very thin and break when laid. Also, too much greens turn them into "boneless" chickens. Made that mistake and found all the chickens would lay down, not move and get soft. They are a lot of fun to turn into pets. You can teach them to protect the yard, eat snails, chase cats, etc. Fresh eggs are great too!
And don't believe anyone that tells you that a chick is a hen and not a rooster.