At mypetchicken.com, they have a short survey that you can fill out, and it tells you the best breeds to get, based on your needs. 1/2 acre is plenty of space for a couple of chickens to putter around in, but find out your local chicken ordinances first, and make sure that they will be safe from the weather and predators. Once you're set up, chickens are very low maintanance. You'll have a ball with them.