The first beast is a system(political)ie OWO,2nd beast is satan himself .The part you missing is that satan is all of them,depending on what role he's playing
Revelation 17:8 "The beast that thou sawest was, and is not; and shall ascend out of the bottomless pit, and go into perdition: and they that dwell on the earth shall wonder, whose names were not written in the book of life from the foundation of the world, when they behold the beast that was, and is not, and yet is [shall come]."
This "beast" was in the Garden of Eden deceiving [beguiling] Eve; he is not here now, for he is in heaven accusing the saints before the throne of God, now. He [Satan] will ascend out of the bottomless pit, as we saw in Revelation 9:1, and 2, and "he will go to perdition", following the judgment at the end of the Millennium kingdom age. Friend, "he" spoken of here, is Satan, and don't let any one tell you any different. Satan is the "son of perdition" as recorded in II Thessalonians 2:1-4, and he will be the first Christ to come at the end of this earth age.
"Perdition" means to "perish", and only Satan has had that sentence passed on him at this time. We are told that those "whose names were not written in the book of life from the foundation of the world", [that first earth age], will wonder, or follow after Satan. They fell in the first earth age, and they will also fall in this earth age. Those of who were chosen in that first earth age stood against Satan then, and they will also stand now. They are God's elect.
When the last of the elect, and the 144,000 of Israel are sealed, then Satan will arrive as the Antichrist. This age is a repeat of the first earth age. Now, what about the other Christians? They will follow false doctrine, and go into Satan's camp. The deception will cover the whole earth, yet the truth is in your hands to forewarn those around you in this generation.
There will be no equal to the deceptions that are going to come, in the history of all mankind. Yet the sermons of today are full of nonsense, with no sense of urgency given even as this great hour of deception is at our doorstep. The Church sleeps, while the Kenites steal the sheep.