You should get 2... because they are social birds.. and one is going to be very lonely in your coop.
When it gets mature it will want a mate... and if its on its own it will just fly away to find one.
2 will just be as tame as one!
Don't get young birds to hand raise either.... that is making a lot of hard work for yourself, and the pigeon may die if you don't get it right... also it won't make them tamer than if you just get a couple of young birds that have started to feed themselves.
If you call them each time you feed them they will know you are associated with food.
Just look how friendly the feral pigeons are on the streets.. no one had to hand rear them!