What up with the sources?

The sources that I have acquired so far for my narrative consists mainly of the history of the Lewis and Clark Expedition and how their meeting at the Falls transpired. I feel that this information could have certain significance to my narrative by elaborating further into the history of the Falls. I am possibly going to start searching for sources relating to the volunteer work and community service opportunities available at the Falls. It always seems that I am unsure exactly how I want to take a narrative that I write until I actually start writing it.