The first day is always the hardest too, once (if) you make it through day one..it will be easier to understand.
Pretty much you try and find the ones that are on the bad side, if you are an innocent, if you are not..then you try and steer the innocents into thinking others are on the bad side.
As said before ask lots of questions if you need to, some question though you want to send to the mod and not on the game thread itself...like any questions about your role.
Read through some other games and see how they went, so maybe you can get a feel for the game.
Most important...DO NOT let what people say bother you, remember it is a game and ppl are going to say alot of things against you, call you a liar, say your twisting things, say you are saying things you really aren't. It is part of the play I know the first few times I was like what ever you are a jerk (thinking to myself), but you have to realize they are not truly against you as a person, just you in the game. HAVE THICK SKIN!!