The story in the Bible began with God creating the heavens and the earth. You can read that post or watch that video in Chapter 1.1.
According to the creation account, the Creator spends the better part of 5 days creating everything we now see.
At this point in the story, earth has been furnished. As wonderful as it was, it still required one final touch. Like any great masterpiece from any great artist, it needed that personal touch, the artist signature, a way to finally mark his creation--US.
IF CREATION IS THE WORK OF AN ARTIST, WE ARE HIS SIGNATURE.
To properly understand the magnitude of mankind's arrival in the story we need to understand that nothing was created without purpose. The story makes it clear that everything was created with intentionality. That means, we can view everything God did leading up to the arrival of mankind the same way we view a baby room.
When a couple is expecting a baby, what do you they do? They prepare a room for it. They are excited for the arrival of their child.
When parents prepare a baby room, they furnish it for the child. They paint it colours for the child's enjoyment. They place toys and stuffed animals inside for the child's comfort and delight. They might hang a mobile over the bed to inspire awe and wonder.
This room could look perfect. It could look like the parents dragged and dropped it straight out of Pinterest. Regardless of how spectacular the room looks though, the truth is that room will never accomplish its full purpose until the one it was created for enters into it.