Adam and Eve initially had two children, Cain and Abel. After Cain killed Abel, and was cursed to wander, Adam and Eve conceived another child named Seth. These sons are explicitly named in Genesis, although it does state that there were other sons and daughters as well (Genesis 5:4).
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According to the Bible all humans on Earth are descendants of Adam and Eve. Their children Cain and Seth create two separate lineages of human life on Earth. Cain and Seth would each have had sexual intercourse with one of their sisters (or nieces) to propagate humanity. [[Incest]] is normally a problem because of the likelihood of both parents passing on the same genetic defects to their offspring, but in this case the genetic defects would not have had time to occur, so would not have been a problem.
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Eve initially had two children, Cain and Abel ''(Cain is not Adam’s son, Genesis 5 lists Adam’s genealogy, Cain is not among it)''. After Cain killed Abel, and was cursed to wander, Adam and Eve conceived another child named Seth. Cain came upon the land of Nod (Genesis 4:16-17), and took himself a wife.
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All of the races were created on the 6th day of creation (Genesis 1:26-27), Adam and Eve were not created until later (Genesis 2:7, Gen. 2:22). More evidence of this is noted above from Cain coming upon the land of Nod. Had Adam and Eve been the only people alive at that time it would not have been possible for there to be other cities much less anyone else alive.