Basic supplies for babies: Brooder, bedding like pine shavings and peat moss, heater, thermometer, waterer, feeder, starter feed, and oregano oil or electrolytes.
For fully feathered birds: coop area or area separated from adult birds for a period of time. Feeder and waterer. If introducing with other birds have 2 feeders. Some heat IF needed.
Some supplies we like, see pictures but don’t need to get here: