Just an advice from me.

One of my friends ask how did I write my fan-fic and I'll just post it here for everyone to know how my mind works.

I write my fan-fic:

1st it to create a story, or an arc with summarized contents like the journey of mc towards a place, encounter, and happenings.

Note: you can just leave the conversation, fight scene and other info later.

2nd research on things that you'll add to make it interesting. Make some twist and turn to make it more interesting.

3rd is to connect the conversation, fight scene and other info for the readers to follow.

lastly read your work and edit all the wrong spelled or wrong grammar.