There are some great sites online. Some years ago I found quite detailed histories of the Mormon years in Nauvoo. This included their reasons for moving there, how they were received, how they came to dominate city and county politics, the battle that killed Joseph Smith, and their flight. I also found many names. I was looking for whether one of my ancestors was involved in the anti-Mormon movement in Nauvoo, and found that. Just keep googling, and you'll be amazed what you find. Each site will give you a different slant. Some will lead you to books you may want to read for more background.