Need help starting my book can anybody help?

I have everything else planed out I just need help with chapter one page one. I was thinking of started it with some kind of a story that tells how everything began, (seeing how it's a biblical supernatural book), یا have it start with one of my main character's childhood memories, dreams یا nightmares. یا if I go with the idea of it being a story should I have the main character (seeing how when the story would be told she is a little kid) interrupt making it obvious that it is a story, یا hold off on the giving away the fact that it's a story until the story is done? یا should I just jump into her daily life right of the bat? I'm sorry I can't give آپ a تفصیل of my book but آپ know how it is.