The first world was between creation until the flood.
The Bible refers to the period of time between creation and the flood as "the ancient world."
4 For if God did not spare angels when they sinned, but sent them to hell, putting them in chains of darkness to be held for judgment; 5 if he did not spare the ancient world when he brought the flood on its ungodly people, but protected Noah, a preacher of righteousness, and seven others; 6 if he condemned the cities of Sodom and Gomorrah by burning them to ashes, and made them an example of what is going to happen to the ungodly; 7 and if he rescued Lot, a righteous man, who was distressed by the depraved conduct of the lawless 8 (for that righteous man, living among them day after day, was tormented in his righteous soul by the lawless deeds he saw and heard)— 9 if this is so, then the Lord knows how to rescue the godly from trials and to hold the unrighteous for punishment on the day of judgment.
(2 Peter 2:4-9 NIV)
This refers not to a new planet being created, but the system of order by which creation functioned and was governed.
The biblical writers distinguished the pre-flood world from the post-Babel world in which they lived, and they pointed forward to a coming third world order.
Based upon the Genesis account, the first world's history included:
- The Garden of Eden (including pure intimacy with GOD)
- The Fall (sin invaded earthly creation)
- Cain murdered Abel and was banished
- Seth was born (providing the bloodline through which the Messiah would come)
- Cain's lineage spread wickedness
- Certain angels married human women and bore giant children called Nephilim, corrupting human DNA
- The Nephilim spread violence, corruption and wickedness
- GOD decided to destroy the ancient world with the flood
- Noah, a righteous man of pure human DNA, built an ark, collected each species of animal and saved his family of 7 others
- GOD flooded the world, covering the highest mountains and eliminating all life from the land
With the first world literally washed away, the eight souls on the ark exited to dry ground. In time, they began repopulating the land.
This period following the flood and before the disbursement of the people into separate languages and nations represents a gap between the first world and the second.