Golden Comets are my favorite. I just ordered 3 dozen day old chicks through the hardware store. They come from a hatchery in Ohio. They will come in the mail on May 1st. I paid the extra for pullets rather than straight run (sexed females vs whatevers in the box). The college I work at is all about Creation Care and going green. I've been selling my extra eggs here at work for a couple of years now. Check your state Ag & Markets for regulations.
My new birds will start laying late August. Extension Office is a great resourse. You can even find online chat rooms about raising chickens. Chick starter to begin with, layer mash closer to laying time. With a good feed you shouldn't need to add extra grit (crushed oyster shell) to their diet. Layer boxes, a good perch, dry bedding, free choice their feed. My hen house is 12' x 12'. I do not let them out because of the dogs. We also have a bald eagle nesting near us and lots of hawks.
I bought 20 chicks two years ago and still have them all. They weren't happy with our long cold winter. Their egg production is coming back, about 14 eggs a day now. They'll be soup this fall.
We have one banty that came from the farm store. She's 3 and is just fun to have around.
Good luck,