I breed pigeons for meat and 'pets'.
Don't use racing or homing pigeons.. they don't have enough meat on them and produce squabs that are too small and long in the leg...and they don't always make the best parents to churn out lots of squabs.
Get white utility king pigeons or some other kind of meat pigeon breed.. these are usually less expensive than pedigree homers.
The don't need 30 - 40 square foot a pair!!!
Easiest way is build a pen / aviary and put up nesting boxes on the back wall. They will breed like crazy. Use dry sand as the floor litter and you can rake it once a week to keep it clean of feathers and dried poops. Make sure the coop is very well ventilated... and kept dry at all times.. then it will stay clean, hygienic and not smell. They don't mind the cold.
Use double nest boxes so the hen can start on her next batch of eggs while the cock keeps feeding the older squabs. This will ensure maximum production. Make about 40cm high, 60cm long, and 40cm deep. Put a board along the front to keep in the nesting material and eggs.. and put in nest bowls lined with newspaper.
Feed a standard cheap pigeon feed and chicken layer pellets mixed in. (you can also use wild bird seed).
They need a bath about couple times a week.. use a couple of plastic washing up bowls.
A breeding pair need about 0.6m square including 0.4m square nesting area.
Its also good to provide perches around the place (where you can't bang you head) at different heights.