If you also want to know, here is my experience as a Recruit at the moment if you want to know what it is like.
First, you get thrown into a completely different world. You won't understand what to do that much ICly and OOCly but that is why you are a recruit, to be taught and learn it. You should have a fair idea what to do OOCly though from watching other CCA units at work when you was a citizen and from reading up on it through forums or other websites. Once you get the hang if it, it'll be quite simple to understand.
And the easiest way not to get BMs from what I know: Don't act like a retard jumping all over etc, and stick to the rules and restrictions.