You will mostly have to make it critter proof and free from cold drafts. Clean it up good, and scrub the floor with bleach water. Put down a thin layer of wood shavings or saw dust, and get or make a brooder that you can control the temperature. You will want to have a nice round guard around the brooder to keep the chicks from getting too far from the heat of the brooder for the first weeks. Once they can fly up and over it then remove it. This should be about a foot high. An alternative to a brooder would be a heat lamp. You can regulate the temperature by adjusting the height. You will have to set things up a few days before you get the chicks so you can have the temperature adjusted to maintain it at about 90 degrees. I think someone else mentioned that you can lower the temp on a schedule as they develop feathers. If they stay huddled near the center of the light, they may be too cold. If they stay away from the light, they may be too warm. You will want to have chick starter in food trays around for them to find. I also put some on paper plates and set them around so that they are sure to find food. Also enough baby chick waterers set about to make sure they can find it. I always make sure each chick drinks a some water before I put them into the brooder. If you find some weaker chicks among them, you can give them some sugar water. That gives them some quick energy.
If you get your chicks from a mail order source, it's important to do the watering of each one. If you get them from a local source, they my have been eating and drinking already. Expect to loose a few the first few days. Some people put some electrolytes in the water that is specifically made for poultry. You can get that from a local farm store.
My biggest fear is having a power outage during the first few days. Also be cautious of fire hazards. If you use a heat lamp, don't hang it by the cord.
If you are only getting 5 or 6 chicks, then you don't need to have a large brooder. I have used a wash tub and a small light bulb for up to a dozen chicks for the first two weeks.
Good luck! keep us posted.