You will need
  • pen and paper/computer, the ability to think, patience
Decide on the theme. It is best to write about what you really care about. If you take a popular topic, but personally uninteresting to you, then most likely, the story will be boring.
Think about the story. The authors who write the stories, without thinking about the final, or scribblers, or geniuses. Graphomaniac, it's likely you yourself do not. Well, if you're a genius. But it is better reinsurance and is related to the story responsibly. You should know in which direction your hero is moving and what goals it pursues. Most importantly, you should know what you want your story to say.
Create succinct and intriguing plot. If you write for people, not for yourself, you need to learn how to capture the reader's attention from the first paragraphs. Writers with the name can afford to describe a dilapidated house on the first page page of the story. Newcomers have no such privileges. Neither Internet users nor the magazine editors will not read a work by an unknown author, if they are not interested from the beginning.
Write an unexpected ending. Predictable ending can ruin the best story. Surprise your reader, shake him, and he with impatience will wait for your next work.
Consider the motivation of the characters. You must be able to justify any action. If it can't do you, the reader, much less be able. And if he could not understand the logic of the story, it is likely that he will cease to read it.
Re-read the written story. Chances are that you will find the inconsistencies and stylistic flaws. Correct them. Re-read again. You must have missed some mistakes... Correct and read as long as the story does not suit you.
Give your work to a person whose taste you trust. Perhaps he will see the error text, which you did not pay attention. Only after this editing your manuscript to submit to the judgment of readers or editors.