Write, because no one is a writer, all of our heads are full of garbage, and the only outlet is the keyboard.
My method has no order, I write a scene, which something must come before and after. While I thought I knew, writing makes new connections, let the work teach you. My first book ran 25000 pages, I used some of it to reduce it to 250 pages.
Anything you write can say the same thing, better, in half the words.
Let it flow freely, then Edit, Edit, and keep the story.
After a while, you find your writers voice, which leaves less to edit out, but keep adding fluff, for some of it develops, some does not.
Write like no one is watching, they are not, read it like a reader for the first time. The goal is the reader, but to get there, takes excess writing, which leads to the work educating the writer, which leads to a rewrite, and it still has to pass reader comfort.
It is story telling, there is no set path, some start with an outline, some just write a scene, Most of what I write does not end up like I thought when I started. Writing, and worse, Characters, talk back to the writer.
Give your brain a chance to talk about you, it will. Brain cells do pay attention, and when a group get control of the mad ape at the keyboard, others join in.
We are many things, but mostly one at a time, writing lets other brain parts join in. As the reader has other brain parts it works.
You are you, the readers are young, old, male, female, the story has to be for all.
You are the one with doubts, your brain is calling for a book, just let it run. Writing random will start the process, till suddenly the brain sees it can skip you and go directly to the keyboard. You are just an ape for brain transport. It is Other, the reader is other, you are outvoted 2 to 1.
Ten pages a day, everyday. establish the flow with words about dust on the table and the track of an ant, and more content will come.
Sit, type, hold a long conversation with your brain. Crazy people talk to themselves, writers write it down.
Good Luck!