If you are thinking of getting hens to have fresh eggs, you will need a coop. The size of house you get for the chickens will depend on the amounts of hens you have. The design you choose will depend on you.
The best way to go about acquiring a hen house is building one yourself. You can go out and by a coop but from my experience I do not recommend it. One of the biggest reason why I do not recommend a kit is because of the quality. The one I bought looked great and had lots of decent reviews but it did not last long before it fell apart.
The chicken coop I have now was built by me and it is heavy duty. It is built with 2×4 and quality material see the plans http://www.diygardenplans.net/chicken-coop.htm for this coop. I have 4 chickens and they have plenty of space. This design allows you to clean out the coop easily. It also has a nest box that makes checking for eggs very easy.
When you are looking for a design keep in mind how many chickens you plan on getting. You do not want them to be over crowded, make sure they have room to move around freely. The design should also have a nest box for eggs. A big door will allow you to keep the coop clean. The house should also have a vent and a roost. A small door for the chickens with a ramp is ideal to give them access coming in and out.
There are quite a few things chickens can eat such as kitchen leftovers. Leftover vegetables and fruits can be shopped up and fed to the chickens. You can as well feed them corn but keep in mind corn has GMO. If you live in a big ranch and have the chickens loose they will find lots of good food by scavenging, such as bugs and grasses.