THE BOOK OF RELATION
I would suggest that you read through this 2 page 'Short Overview' before you go to the 'Overview of the Book of Revelation'.
This will give you a very high level view of the book which may help to understand the book better.
Overview of the Book of Revelation
Is there a Battle of Armageddon?
From the website
Alexandar Campbell, Biographical Sketch
Chronology Of The Life Of Alexander Campbell
More restoration information on the website