I think the story out of the Bible tells it all. It just takes some people a long time to believe that information. The exact methods used is not explained of course, but just know that God says he caused it to be. If a person can believe that, then it goes a long way toward making the rest of the marvelous creation story believable. Disbelieve it & little else in the Bible will make sense.
No ... it tells "Who" and "why". Doesn't say a word about "how".
"How" is the realm of the natural sciences.