Story telling is one of the two principle skills required for writing -- the other being the craft of writing -- and it is hard to do well.
You need to come up with a character that has unique traits, preferably a mix of good and bad traits. Write your character down.
Then decide on a goal for your character, pick a motivation that makes sense for that goal. And write it down.
Next list out each of the 12 stages of a Hero's Journey on a piece of paper.
Put the goal in the right spot -- somewhere near the end.
Then pick a point in your story to start -- picking up power converters from Tochei Station, perhaps, or bulls-eyeing womp-rats in Beggar's Canyon.
This is your first stage.
Next start filling in the stages with external and internal problems for your character to overcome to reach their goal so they are consistent with the Hero's journey. You just need enough information to know what happens in this stage, high level stuff and big plot points.
Keep in mind this isn't easy, unless you are one of those rare persons with an innate talent for storytelling; the rest of us have to work very hard to learn to do this.
The important part is to not try and keep it in your head, but to write it down.
This is because the alternative choices for each stage multiply geometrically, overwhelming your imagination and intellect keeping it straight. But, if you write it down, you have a concrete relationship between the different stages and you can decide if you like it or if it's too much like the plot of your favorite Three's Company episode.
Then, if something isn't working, you can re-work it. Add and subtract character traits. Alter motivations. Do whatever you want until you have a complete story you want to tell.
Lastly, you take all your stages and write the story.