God existed and has always existed. God created the heavens and the earth. Some people ask why did he create heaven before the earth but he could have created them at the exact same time. The bible doesn't tell us this detail. At first, the earth was formless and dark so God created light. He separated light from dark and named light "day" and dark is calls " night".

Then He separated the water from water to be the sky and clouds. And He created land. The third day, God created plants and trees to produce fruit with seeds so this leads me to believe He was already planning to create something or someone to eat the fruit. He already has created vegetation two days before any animals so That shows He knows what he is doing. Then He made the sun and the stars. God had days without the sun so where did that light come from? The bible doesn't tell us so we will have to ask Him when we meet Him in Heaven. we are now on the fifth day and He makes all living creatures. On this sixth day, God made man kind and gave them the garden. He commands all living things, this includes humans, to be fruitful and multiply. Now it is the seventh day and God rested from all this creation.