Good general book on Bible prophecy, includes Revelation but also other portions of Scripture; from a dispensational framework, like Joel Rosenberg’s The Last Days.

Complete Book of Bible Prophecy by Mark Hitchcock

Revelation, John MacArthur Study Guides by John MacArthur (also pretrib rapture approach)

Big commentary on Revelation, showing each passage as viewed from four different viewpoints:
Revelation: Four Views

Here are two other interesting possibilities:

Don’t know if you’re familiar with the “Idiots’ guide” series, but they’re really not for idiots, of course. They just try to be very clear in their communication. This one’s on the book of Revelation:

The Complete Idiot's Guide to the Book of Revelation by James S. Bell Jr., Stan Campbell

Revelation (God’s Word for the Biblically-Inept Series) by Daymond R. Duck and Larry Richards
This one looks fascinating, also supposedly fairly easy to understand, see the great reader reviews

(If I was to get either this or the Idiots’ guide, based on reviews, I think I’d get this one.)