You will need a nest box for each pair of pigeons you plan to get plus a few extras. Five-gallon plastic pails, cut in half, top to bottom, and fastened to the wall will make fine nest boxes. Fill the nest boxes with straw or long pine needles. Provide containers for food and water that the birds can eat from but not get into, if possible. Feeders made for chickens work or you can cut openings in empty gallon milk jugs.
Pigeons are social birds, so plan on three to five mated pairs to start.
The local feed store will have bags of Pigeon Chow and all you have to do is carry one home and dispense to the birds. They appreciate chopped greens from your kitchen and love whole-kernel corn and stale baked goods, like good pigeons everywhere. Always keep fresh clean water available to your birds. Make sure it stays clean and does not freeze in winter. Croppers are a good choice or White and Silver Kings, even Indian Fan Tails are a good choice.