A lot of people want to write.. but most get stuck on what to write about. Whether you're writing a script, a novel, a short story, or writing for no particular reason, here are 3 tips that might help you get started.
1. Write What You Know - You've lived a life that no other person has lived and you have a perspective that is totally unique. If you look back at all of your experiences, there's a good chance that you'll find a few that would make great stories. You can write about events you've been through, people you've known, relationships you've had, etc. Since you have a personal connection to each of these experiences, going into detail and making them sound genuine shouldn't be a problem. And keep in mind that you don't have to write things exactly the way they happened. Your goal is to make your story interesting so keep what you like and change what you don't.
2. Write What You Imagine - Along with your "real" life, you have parallel life that is going on in your mind. This life is filled with your hopes, your fantasies, your fears, imaginary conversations, and all kinds of other things that will most likely never become a reality. Pay attention to what goes on in your head because it's filled with a lot of useful material for your writing endeavors.
3. Re-Write What Other People Have Already Written - Remakes of older movies or TV shows are usually lame as fuck. But some of the best movies of all time were based on books. Goodfellas, Jaws, Forrest Gump, The Godfather.. all books. So go read books. And once again, you don't need to stick to what you read word for word. Keep what you like, change what you don't and make it your own.