I also noticed reading the creation story in Genesis, that according to Moses, God, seven different times approved what He had just created and called it … "good."
Did God have a previous creation? Yes, I believe He did. "Isaiah 14:12-17" speaks of … "nations, heaven, clouds, earth, kingdoms, a wilderness, and destroyed cities." This scripture lists all the ingredients needed for a pre-Adamic earth to fit squarely between Genesis 1:1, (the creation millions of years ago) and Genesis 1:2, (how the earth is left in chaos from God’s judgment) after the fall of Satan.
Satan must have known about the two trees and the warning God gave Adam not to eat of the Tree of Knowledge. Really it was a command not just a warning. I don’t know how Satan knew about all of this, other then the fact that he was an angel from the spirit realm, which made him higher than the natural human realm that Eve was from.