There's nothing in Revelation to indicate that we should do anything else but start with Babylon as the first head. Since the "Little Horn" papacy which came up among the Ten Horns in 538 A.D. is still running it's mouth at the time of the final Judgment (Daniel 7:9-11), we should expect to find the papacy alive and well and ruling over the Kings of the Earth and the Merchants of the Earth - the 3 facets of the NWO: a one world false religion, government, and economy.
Yes there is, the book of Revelation says "5 kings are fallen and one is", and the king that currently was in authority when Revelation was given to John were the Romans, and the 5 kings that had fallen were the 5 kingdoms leading up to the first kingdom, which were the Egyptians, where among those 5 kingdoms are the kingdoms of Daniel. There are no other kingdoms those heads would be, except the kingdoms I mentioned, and the 8th and last head is the United States of Europe, which will be in authority when the second coming of the Messiah happens. As such, by the time the 8th head appears, the prostitute of Babylon has already appeared, and is riding the first beast of Revelation as a separate and distinct entity, which is Vatican City, through which the little horn of Daniel still exists, riding the formation of the USE, through which it exerts its authority throughout the entire world, through money, which all traces up to Vatican City.