Go to your teacher for writing/language arts. Tell him/her that you want to write a story. Stay in for recess a few times so they can help you. Read a grammar worksheet. Do a grammar worksheet. Learn how to construct good dialogue. Expand your vocabulary. Make the basic outline. Make a few characters. Start the writing process. I'm writing the same book I've been working in since I was in 4th grade. I took the idea, wrote a short beginning for it, and I've been improving it every chance I get. As of now, I'm talking to a publisher. The only large problem in my way is how to earn the $800 that I need to get it published. I am a thirteen year old, and I almost have a book published. Follow the steps above and put in a good effort, then maybe you will have a published book in two years as well.