There is a book called, "WHAT THE BIBLE IS ALL ABOUT", by Henrietta Mears. It is an excellent tool for understanding the broad sweeping themes in the Word, and the Bible as a whole. It goes book-by-book; its loaded with not only facts, but gives understanding of how Jesus is revealed in every book from Genesis through Revelation.
Also, there is an awesome prayer in Eph. 1 that all of us should avail ourselves of when opening the Word. "I keep asking that the God of our Lord Jesus Christ, the glorious Father, may give you the Spirit of wisdom and revelation, so that you may know him better. I pray also that the eyes of your heart may be enlightened in order that you may know the hope to which he has called you," Eph. 1:17-18 NIV We can all benefit from the Spirit of wisdom and revelation -- and -- for the eyes of our heart to be enlightened.
In Christ's Love
Nanaroo