Creation Questions

The Genesis story of the English bible purported that Adam and Eve were the first humans on Earth. Adam and Eve, it stated had two sons, Cain and Abel at first. It shows where Cain slew Abel. After this incident –even though he complained that someone may killed -- the Creator expelled Cain from the Garden of Eden. (Genesis:4) Who was going to kill Cain and who did he get married to in the land of Nod? (JW-UCYG)