Hi, I had Pigeons when I was a kid, I got them as older birds and I remember I could let them out and they would come back.
If I were to get Some Pigeons now, ( Unsure what age I can find ) how do I train them to come back? as long as they are "kept up" for a couple weeks they will return to their loft on their own. And that's considering they aren't homers which have been flown before. If so, they will go right back to the person you got them from. So, if you do get homers, get young, un-flown birds. Beware!! as people will lie to you. You can also get adult homers, don't let them out, and then fly their babies. You should also teach your birds a feed call that they respond to, when you want them to come in do the feed call and shake the can and they should all come in to be fed. It is a good control to have.
Do they come back at dark like Chickens do? yes, and throughout the day when they feel like it.
Do they eat chicken feed? Yes, the layer pellets and grains. make sure they have grit.
Is there certain types of Pigeons I should look for? Stay away from? most any are good, but a few are not. very big globes, too short a beak, or very heavily feathered around the head and none of those can raise their own babies. Large muffs, fantails, frill backs, large crests none of those will perform well as flyers. it al depends on what you want pigeons for.
How many Pigeons are good to keep? Can I mix different types? depends on the size of your pen, and you can mix them together.
Can I house them with the chickens? NO! they will most probably get sick and the chickens will kill the pigeons!
I hope that's of some help. Feel free to ask any other questions.