Narrative is a subject in itself.
One I happen to have taken, so .. start with ..
establish a normality,
quickly followed by an "inciting incident",
have 5 acts and/or 3 plot points
and a nadir (low point, usually bang in the middle of the story) where everything has gone wrong for the protagonist, and from where they
defeat their inner demon (some personal, mental problem) and
then the outer one (the baddy).
You might want to consider "rising action". There are graphs on the internet.
Your story doesn't have to go like this at all, people have successfully messed with narrative structure, but if you're looking for a classic formula, there it is.
P.S. It's fun to watch a film with this stuff in mind.