I don't know anything about pidgeons, so I can't help you there.
Basically if you have a decent sized backyard with room enough for a coop and flying cage, you're already halfway there. They're extremely easy to maintain, which explains why they're so common around the world, they're extremely adaptable.
Mine are in a 12' x 10' x 6' chain link dog pen. It's set on a concrete pad for ease of cleaning and digging predator proof. We lashed on the top heave wire grating, and over that some scrap pieces of sheet metal roofing, scraps we found leftover from our pole barn. I've got young sapling trees that I cut due to their diameter in size and soft bark, angled in corners or across the length of the pen for perches, and I've got a tiny old decrepit patio table to set the food bowl on to keep rodents out and keep it out of the weather.
Ideally they need a small house attached to the cage with perches and nest boxes, think of a small yard barn type thing.. Right now, mine don't have that. We have more irons in the fire with stuff going on than it can get taken care of. It doesn't have to be anything complicated or fancy. All they really need is a dry roof over their head, a windbreak, and a place for nestboxes.
Or a single pair can be kept in a rabbit hutch style cage. Most have a wire cage portion, and an enclosed box portion. I used them for single pairs I was intending for specific breedings and they work fine. Although they do really need a place to fly. If you don't have birds of prey, you can let them loose during the day and they'll return home at night. Although don't do this for 2-3 months after getting them, or they'll return from where they came or at least try to get there. =P
As for food, Rural King around here sells scratch grains meant for chickens, its whole wheat, whole milo, and cracked corn. I supplement it with chicken layer crumbles that has vitamins and minerals.
Clean water can't be underestimated. Pigeons are copious drinkers and bathers. A shallow wide bowl works well. Right now mine have a kiddy pool from the ducks they use that I empty and refill each day. But before that they had one of those black rubber bowls you find in the horse/livestock section of any farm store, they're indestructible, which in the winter you need when the water freezes and you have to kick the ice out. Its around 4-5" deep and 20" across.
Other than that, there's not much else.
Here's a link I found that is pretty concise:
Care of Domestic Pigeons(Columba livia)
