To whom did Cain in the Bible got married to and which people was he afriad that they will kill him?

The Bible tells us that Adam and Eve was the first creations of mankind. And they have 2 sons Cain and Abel. Abel killed his brother Cain. as a result of that he was punished by Lord. GENESIS 4:14 - Cain said to the Lord ''You have banished me......; You have made me......; All who see me will try to kill me! In verse 15- The lord replied,''they will not kill you,for I..........to any one who does.'' verse16- So Cain left and settled in the Nod ''east of Eden.He got married and later had a son Enoch''. (PLEASE, HOW COME WAS HIS WIFE AND OTHER PEOPLE) I AM CONFUSED! HELP ME OUT!