All of the Biblical theories of Creation believe that God created everything in six days, though the length of those days varies.
Day 1
Genesis 1:1-5 says that in the beginning, the Earth was a formless, empty, dark void, and that when God told them to, the entire heavens were created, not just Earth. Immediately after its creation, the Earth was dark, perhaps because it was covered with thick clouds. Finally on this day, God told the darkness and light to separate, which created day and night.
Day 2
In Genesis 1:6-7, God told the water and sky to separate (some sources say this was when he created the atmosphere). He also made streams "come up from the ground and water the Earth" (this could have been him "setting up" the water cycle).
Day 3
Genesis 1:9-12, or “The Cornerstone of Foundations”, says that God gathered the waters, “seas” and formed dry ground, “land” or “earth”. God could have used plate tectonics to do this because the land already existed; it was simply covered by water. Later in the day, God made vegetation on land and let it use photosynthesis, germinate and grow until it produced seeds.
Day 4
In Genesis 1:14-18, God marked seasons, days and years, and could have removed most of the clouds covering Earth to let light in. Many people think that the sun, stars and the moon were created on this day instead of day 1.
Day 5
In Genesis 1:20-22, God created fish, sea monsters (sea monsters could refer to whales and/or other giant sea creatures) and all other water animals, as well as birds and all other flying beings.
Day 6
In Genesis 1:24-2:22, God made the Garden of Eden grow and created wild carnivores and animals, rodent-like creatures, cattle, reptiles, livestock and creatures that move along the ground. God also made one man from the dust on the ground [Adam], and breathed through his nostrils the breath of life. Then, God brought the animals to Adam who named them. Finally, God made a woman from one of Adam’s ribs whom he named Eve.