Read lots. Write lots. Write for yourself; keep a journal or notebook so you can write often, and easily, without worrying about making mistakes. Notice things. Listen lots. Write things down that you think and feel and see and hear and touch. Practise lots. It can take a long time to get a story right. Don't rush it. Let it take the time it needs. Do lots of re-writing. Talk to other people who write. Believe in your story.