Hashem’s role in creating the world is that He, alone created everything in the world, out of nothing. There was nothing in the beginning, and He filled the world with nature, animals, and people. First, (in Perek Aleph) He created day, night, animals, fish, and even people. Later, (in Perek Bet) He gave them all a purpose. Everything that He created has a purpose, and He even created everything with the ability to sustain itself, by giving it/him everything they need in order to survive. I would have liked to know why G-d waited to create man, and why He didn’t create everything on one day.