Martin Wallace has been really good about clearing up those issues over at BGG. This thread, vetted by Wallace, is pretty much all the FAQ you need at this point.
I think it's easy to get tripped up by the hidden roles when you start playing. I was all concerned about outing myself because I was a restorationist and I was worried about getting assassinated. But I think for your first games, you have to not care about folks knowing your role. Maybe down the line there's more opportunity for mind games, but I don't think that's going to happen until you're playing with a really experienced group.
As for the team victory condition -- it's more like a team losing condition -- it's HUGELY important. The cool thing about this game is that it can be pretty short. It's relatively easy to just end the game if you want. The trick is ending it at the right time. And that's what the team situation is all about. If you end when someone on your team is in last place, it's all for naught. Everyone's jockeying for position and timing. Which is why it's not always a matter of loyalists hunting down and assassinating a restorationist's main agent; they don't want the game to end until they've secured their position!