There are hundreds of commentaries about the Book of Mormon, ranging from critical to apologetic. These include books, articles, videos, presentations, and web pages. Below are some links to get you started:
Some sources believe the Hill Cumorah is in New York, as taught by Oliver Cowdery and Joseph Smith. Others believe the Hill Cumorah is elsewhere.
Hill Cumorah in New York.
Letter VII - http://www.josephsmithpapers.org/paper-summary/history-1834-1836/90
Hill Cumorah elsewhere.