Rule #1: Writing is not simple.
Rule #2: Write; Finish what you write; Revise; Have it critiqued; Revise a few more times; Let it sit.
Rule #3: Read. Read. Read — read EVERYTHING you can get your hands on: books in your field/genre; NF research; books for pleasure; books so out of whack from your own writing genre that it would make your fellow writers blink to see you reading them; etc., etc..
Rule #4: Take another look at your story; Revise again.
Rule #5: Research agents and/or editors; submit it.
Rule #6: Start writing another story.
Rule #7: Go out and play. (More grown-up authors might rephrase that to “Go out and live.”)