Cain went out to find a wife among the women of Nod.
He chose between Winken and Blinken of Nod.
You must have heard he story.
It was the land of Nod meaning just "wandering". There was no city until Cain and his wife founded it.
Gn 4:16 "And Cain went out from the presence of the LORD, and dwelt in the land of Nod, on the east of Eden. And Cain knew his wife; and she conceived, and bare Enoch: and he built a city, and called the name of the city, after the name of his son, Enoch."
The earth is not bazzillions of years old. It is as the Bible says, there was no death before sin; no creation before Adam.