Between Death and the Resurrection

What happens when I die? Do I sleep? Do I enter a new life? or . . . is death the end of our existance? Are there any answers to these questions?

So I returned, and considered all the oppressions that are done under the sun: and behold the tears of such as were oppressed, and they had no comforter; and on the side of their oppressors there was power; but they had no comforter. Wherefore I praised the dead which are already dead more than the living which are yet alive. (Ecclesiastes 4:1-2)