Well Antharias, I would say to work first at what kind of story line your wanting to present to your group. Second, try to get your group to come up with their own backgrounds and give you a copy so that
you can create scenarios based on their character backgrounds and work them into your main story. Also keep them in wondering, never let the group know what could be next. A good story teller is one that always keeps his readers in suspense, so do the same with your game. You don't have to have continuous battles for the party to go up against, sometimes having them doing a little research and investigating
goes a long way. Let them feel that they are the ones writing the story but your the one directing the play so to speak.