Thanks for talking about your concerns. I haven't really modeled this rp off of DnD but instead Crpgs me and my friends have played like Planetscape torment and the old Fallout games. I try to make a world and give the characters all a problem to solve, in this case a murder mystery and they have to investigate the world and characters around them to gleam information before coming to conclusions. 

My expectations of you are just to create a character with goals and motivations that we can collaborate on to make interesting stories. So far you've done well in that.