I would suggest starting with "Z3" and "Origin of the Uwd" found on pages 14 and 7. These will familiarize you with the central focus of this website and the STONE found in Zechariah 3. "The Chaldean" shown on pages 10 and 11 is also a good source. After this go to page 49 to discover where you, if American, are living by reading "Babylon City". And of course read "the Dragon's ring" (page 3, 4) for the essential number needed for Apocalypse.
Finally, read page 3 (the reckoning) as and overview of this website an these 68 pages. These reading suggestions will provide a good foundation for the rest of the lessons of these letters.