The books of Daniel and Zechariah fit closely with the Book of Revelation. Other prophets like Isaiah have much to say about Armageddon, the Millennium and even the Great Tribulation. But, Daniel and Zechariah have a specific focus that we should pay attention to, if we wish to understand the events of Revelation more clearly.
Furthermore, there are some descriptions in Zechariah that will change how you will think about key parts of Revelation.
As always, we will have more questions than answers, but we will do our very best to stick to what God actually says, instead of what we want Him to say.