No, nothing like that. Though they do provide lots of food, as well as everything else! [Food is the most pressing point, though he does like to have a place to sleep, clothes and everything else the Black Order offers.]

You're born an Exorcist, though a lot of people never know unless they come into contact with a fragment of Innocence they bond to. I was born with mine, so I learned about them when I was pretty young. I spent a while training after that, before I joined the Black Order.