Fanfiction, or just a fic, is the only and pleasant way to explore the "what if ..." of the original plot. Only in this way, you, wiping away the tears of joy, can miraculously revive the unjustly dead early and unite those who, it seems to you, would ideally fit each other. And in general, turn the course of events one hundred and eighty degrees, being herself a director in her beloved universe.
So, what if? ... Why not try it now? And if you suddenly think, "Yes, which of me is a writer?" - drop this heresy and open Word. In the meantime, it loads, you can look at the step-by-step instructions for writing your best-selling fan fiction for a minute or two.
At this stage, you should honestly admit to yourself how well you know the author's material. If there are gaps, make a small drawing, refresh the information in your head, you need to write only about what you understand.
Note: if you suddenly realized that the world of, say, the Hunger Games is familiar to you with a stretch and the drawing can drag on, choose an alternative reality and come up with all the details yourself - such a move is quite acceptable :)
The more heroes, the more space you're giving for imagination. Each character needs to be written out in color and detail so that your reader is interested in following the development of the plot.
As you call a ship ... The headline should be far-reaching and bright - then you will have something to push off from, and the reader will have something to hook on.
When you post a fix on the site, do not forget about this small detail - intrigue the reader in a couple of sentences so that he can't tear himself away and immediately want to read further. For the first test, describe the plot in several convictions. So the reader will get the impression of the writing style and content of the fic, and you will have a short outline of your text. Outline will help you not to get away from the original idea.
From the very first chapters, develop characters gradually. Watch what words and actions will better characterize your heroes, what they can do, and what will go against their characteristics. This may seem complicated, so start with a detailed drawing of each character - write down its positive and negative qualities on a separate sheet, habits, preferences.
Let the actions of your hero determine his character - the thief will steal, the detective will begin the investigation, and the policemen will write arrest. So you do not have to go into lengthy descriptions of the character's character - the critical moments of the story will describe him.
Note: in extreme circumstances, you can let your character surprise both yourself and the reader :)
No need to blow up your reader's brain with dozens of climaxes in a few pages. Give him a space to relax. Let you have action: battles, fights, collisions of all kinds, disputes, passionate scenes of love confessions, dinosaur attacks, and the like. But! Not all together on one page!
Develop the action gradually, with ups and downs, so your text will be easier to perceive.
Dream and dream in reality. Visualize the development of events, the appearance, the situations in which the characters fall, talk to yourself dialogues and monologues. Imagine everything you want to put in your fix, and then write it down - at least on a piece of paper. So that an ingenious turn, say, of the third chapter, does not go away until you finally get to the computer.
Put the computer down. Freshen up. Take a walk with the dog, take a shower, have some tea with dryers. In general, turn off the brain. And then return to the written, reread, think it over. It's also useful for literacy (you don't need any wise guy to write hurtful comments about your typos later), and for the integrity of the text, and to understand what to write about next.
The interest in the fic is the higher, the more in it from the original work. Have you invented your heroes? Put action in a new universe? Were you wholly departed from the canon? Perfectly! But leave at least something, some connection with the original, which so inspired you at the very beginning - and your reader!
It is essential. Even if continuing a book became hard. Even if what you writing began to seem silly and infantile. Even if the muse stopped visiting you. All of these are temporary. Take a break. Distract yourself. Start writing something else, or stop writing for a while. Everything will be back. And you should be ready for this - a Word document doesn't take up much space, do not press delete button!
Note: but if you suddenly clicked, don't blame yourself - you can always start from scratch :)