I usually raise chooks in batches of two trying to keep a henflock size of 6. We generally start out with 2-4 day old chicks. Chicks are pretty weak compared to chickens so you have to make sure they have a consistant 90-95temp, the chicks themselves let you know how warm they want it, they should be lively but not squeaking, only small peeps. Louder chirps mean they are too cold, and if they are panting and keeping as far from the light as they can it is too hot.
For the first few weeks I keep a cardboard box inside the cage with them. Build-a-Bear boxes make great chick huts, about the time it gets too small the chicks don't need the box to trap warmth anymore since their feathers are coming in and the light can be suspended over the open cage. During the first week the food bowl is kept inside the cardboard box. Make sure the water is on a direct line of sight and very close to the door. Chicks need to drink water while eating. After about a week the food can be left on the outside. Over the box I keep a 60watt heatbulb. Over the open cage I keep a 100watt heat bulb and turn it off when it off when it's too warm in the house.
Most feed stores will carry a good chick starter feed. This is all they need for the first two months. Handle the chicks gently but often. The first month is the most important for getting them used to being handled. Feed them treats from your hands if possible so they associate you with the benevolent food god. I like getting baby crickets from the pet store and letting them loose inside the chookhut. If you spend an hour a day socializing your chicks they will be the most charming, sweet, tame birds ever. This size cage will hold the chicks up until about a month and a half. When these chicks reach that age I will post showing their next set of accommodations.