PSacremento - keep it at, but don't limit yourself to the book of Revelation, you'll find many other books in the bible give further insight. There are 2 distinct groups, and even the old testament mentions it.
Things to research, "The elect", "Son of Man", "Son of God", "The chosen", "holy ones", Jews vs Greeks, Gentiles vs Israel, The Vine and being grafted on or off, WHY Israel has been blinded and if that will change or not, etc.