In support to what the others have said, there are a few things to remember too; 'To build a story is to weave a good tale, to spin a good yarn.'
Because your protagonist will have to 'go through a maze of challenges in order to complete their quest, with all of its twists and turns.'
In order to do this, YOU must know of, or research info related to your story or come up with something that you, as a writer, can explain or justify. (You may have already done this!)
So, there is a beginning and end to your story. There MUST also be a traumatic event that challenges/change/TESTS your protagonist at some point and thus, change their direction/view/training in order to direct the character to the end of the story. (What?!)
Think 'twist and turns.'
So, bringing back the 'weaving, spinning' metaphors, there is something to remember. Who are all of the main and supporting characters in your story? Do a character description of each, because just like you and the people you know in your life, none of you will react to any situation the same. (Some may not agree, but I find it helpful to keep consistency. DO WHAT WORKS FOR YOU, not for me.)
Also, the in-between parts of the beginning-to-challenge-to-end, are really a bunch of short stories of good, bad info and right, wrong decisions (like a maze) that are a part of the 'weaving, spinning and building' of your story.
Plan it out.
Know the characters.
Have a beginning, conflict/change, and end.
The rest is a maze of situations, so let the characters fill in the rest.
And as others have said. Have fun! You have an idea for your story, so let it write itself. (But with your guidance.)
My humble opinion from my own experience.
Good writing! And here's to a hopeful publishing too!