Get a big tall-sided container, preferably with a lid, to keep them in until they're too big. Put newspaper in the bottom, with straw on top of that (or shredded paper.) (NOT cedar wood chips!) Put a lightbulb hanging in one corner of the container for a warming bulb. (those clip-on student study lights are perfect) Get some starter feed to feed them until they get their real feathers. We use a short ball-jar to hold the feed and water (separately!) and feel it keeps things cleaner.

Prepare the change the chicken's litter, water and food DAILY. Especially if it's in the house with you (to keep warm.) It will smell some otherwise.

Start building your chicken coop/tractor now. It will take longer than you think.
Oh, and handle them from day one, if you want people-friendly chickens.
Enjoy your baby chicks!!!

thanks so much for the descriptions- they are helpful. We do have a coop for when the bird babies grow up, But I am a little forgetful on what to do when they are sooo small.