1. The best way to learn how to write fiction is to read great novels. It’s learning by osmosis---you’ll pick up concepts like how to structure a story, craft dialogue, and master point of view, without even realizing it. Which isn't to say that how-to book don't have they're place, of course. I'm currently reading James Scott Bell's latest, The Art of War for Writers, and most certainly recommend it and others. But if we only read the books on technique without actually reading other fiction, it's possible we'll get stuck.
2. Start writing about what you love. You will write best if it’s something you’re interested in. Do you love horses? Write a story about a woman struggling to keep her horse farm afloat. Do you love airplanes? How about writing a story featuring a hot shot pilot? My sister Tracy started out writing articles about Christian musicians for youth publications because she loved Christian music. We will automatically have a drive if we write about something that excites us, or something that we're curious about.
3. Writing is an apprenticeship. It can take at least ten years to master the craft enough to think about publishing. If we go into it knowing that, it’ll help us on those days when the words just aren’t coming. I started writing as a teenager (if you don't count the silly animal stories I wrote as a kid). It took fifteen years before my first book was accepted for publication. Granted, I knew nothing when I started, but that gives you an idea of the commitment you need to have. Maybe it won't take you that long. But be prepared for it.