Unless all you knew about 40K was the rules, I doubt it. But in any case...
For a basic breakdown, you're a member of the Inquisition. Effectively, you're a member of the FBI/CIA of the Imperium of Mankind. I haven't decided what sub-section any of you are part of, but after the first adventure, I figure I'll just draw a bunch of lines on the floor and see which ones you follow and work from there.