Step 1Think of the book, movie, TV show, cartoon, orother source you would like to write fanfiction for It can be anything from your current favourite paperback novel to the old TV cartoons you used to watch as a child.
Step 2Brush up your subject knowledge If you haven’t watched/read the original work recently, do so. People read fanfiction because they are fans of the original work, and they’d like it to be accurate to the original work (characters, settings, key ideas).
Step 3Choose the characters you’d like to write about You can have as many or as few as you’d like. Make the characters similar to their true identities - or explore the possibilities of a different personality. You can add a new character, but make sure it is original.
Step 4Think of what you’d like to write about You can set the story in the past - a prequel-, in the present -what is currently happening-, or in the future - what could happen to the story. It can be somewhere completely different, in an entirely unique setting or time period. [alternative universe]
Step 5Capture the mood Dark and mysterious or lighthearted writing? There has to be a mood and you can choose any.
Step 6Start writing! After all this hard work thinking, get writing.
Step 7Revise and proofread Make sure there are no spelling or grammar errors. Ask the teacher to correct or improve it. Make your writing the best it can be.
Step 8Publish your work If you wrote it, for sure there are people out there somewhere who want to read it. Look for a fanfiction page to publish it.
Information taken from:http://www.wikihow.com/Write-a- Fanfiction