Wow that's a hard question and I'm not sure how to answer it other than as one person above stated, just write, and keep on writing.
If you've never read Robert Heinlein's Rules of Writing then I strongly encourage you to do so, especially the first three.
Rule One: You Must Write
Rule Two: Finish What You Start
Rule Three: You Must Refrain From Rewriting, Except to Editorial Order
Published Author Robert J. Sawyer expanded on that last rule with these comments
"This is the one that got Heinlein in trouble with creative-writing teachers. Perhaps a more appropriate wording would have been, "Don't tinker endlessly with your story." You can spend forever modifying, revising, and polishing. There's an old saying that stories are never finished, only abandoned