A lot of amateur writers decide to write a fiction because they already have a story or a concept in mind.
However, there are some other peoples who would like to write, but who don't know what to write. They have the motivation, but not yet the inspiration.
This tutorial is for them.
Step 1: The seed ...
Exactly like giant trees grow out of a little seed, your fiction needs something to start from.
This seed could be a simple sentence, a simple idea involving someone, a concept.
If even for the seed you're out of inspiration, just pick a name, a verb, and an complement.
For instance :
"John found a tiny medallion."
"It's a man who's very exhausted."
"Jacky has lost her cat."
"Mike got fired."
"Martin fell in love."
"Paola wakes up."
"Marina answers to the phone."
You don't need more. That's your seed.