If Adam and Eve were the first Creations, then who created those Cain met in the Land of Nod?

7And the LORD God formed man of the dust of the ground, and breathed into his nostrils the breath of life; and man became a living soul.
http://biblehub.com/kjv/genesis/2.htm

The Creation of Woman

21And the LORD God caused a deep sleep to fall upon Adam, and he slept: and he took one of his ribs, and closed up the flesh instead thereof; 22And the rib, which the LORD God had taken from man, made he a woman, and brought her unto the man.

23And Adam said, This is now bone of my bones, and flesh of my flesh: she shall be called Woman, because she was taken out of Man.
http://biblehub.com/kjv/genesis/2.htm

16And Cain went out from the presence of the LORD, and dwelt in the land of Nod, on the east of Eden.
http://biblehub.com/kjv/genesis/4.htm

Where did Cains wife come from and/or who created her?

17And Cain knew his wife; and she conceived, and bare Enoch:
http://biblehub.com/kjv/genesis/4.htm

"Nod" (נוד) is the Hebrew root of the verb "to wander" (לנדוד). Therefore, to dwell in the land of Nod is usually taken to mean that one takes up a wandering life.
https://en.wikipedia.org/wiki/Land_of_Nod

The Land of Nod is a magical dreamworld where everyone goes to dream
http://evil.wikia.com/wiki/Land_of_Nod