In the Dramatic Scriptwriting course that I took at college (an elective), the professor told us how to write a movie script.
Start with 3 Beats (or 3 main points in the story. Turning points, if you will). I've found that these 3 Beats relate to the 3 Act Structure. Then expand those 3 beats into 9 beats (an additional beat coming before and after each Main beat). Then add more beats if you want, and expand those beats into paragraphs. Each paragraph represents a scene in the script. Each paragraph/scene should build on the previous one, because all together they will form the movie. When that's done, expand the paragraphs into scripted scenes, and you have your first draft.
One of the famous screenplay writers (I forgot what his name is) would apparently write the first draft of his movie, then put it in a drawer, leave it alone, and re-write the whole movie. He would do this 22 times, and each time the story would get better.
What I've noticed is this:
Tag Line = Thesis Statement
Trailer = Introduction
3 Beats = Acts = Main Points
9 Beats = Main points and sub-points
scenes = paragraphs
Resolution = Conclusion
That's how people are being taught to write screenplays, and probably also novels, short stories, etc. A story is not an essay. It has a different dynamic from an essay, or a newspaper article.
To write a good story, you must be good at storytelling, or the art of flirting.
I've found that the 'essay' structure of writing a story actually makes it Harder for me to write the story.
It gives structure to a story, yes, but it stifles character development. And characters are what the audience relates to when they experience a story. A well-structured story can fall flat without well-written characters. And story with some plot holes, depending on the nature of those holes, can be forgiven if there are great, well-written characters in the story.
What I think you need to do is strike a balance between planning and characterization. Because you can plan all you want, but until you write the story, you won't know how well it's going to turn out. And even the best-planned story can take a different turn if you develop the characters.
Think of story 'planning' as a 'framework' for you to tell the story in, not the finishing touches of the story.
And for the character you're having a problem with, you may want to develop that character's personality. A memorable character would also have a greater impact on the audience with his death.
The best way to kill an ego is with humility. Humility is acknowledging what you can do, and what you can't do. It's admitting when you're not perfect. Admitting when you're wrong.
An ego is an elevated sense of self-importance, which is inflated by pride. A person cannot be proud and humble about something at the same time. Pride is an unjust elevation, but humility is acknowledging what your limit is.
If you realize that it's okay not to be perfect, and you do the best you are capable of, then you can improve as you go.
One of the big problems that people have when writing is that they edit while they're writing. I suggest that you don't edit while you write, because that stops creativity and then you never get it down.
Write down what you can, and then edit it. Perhaps write in portions, like an episode or a chapter, and then edit it.
But not too much. Only edit it enough so that it 'works,' then write the next chapter.
After you've written everything down, you can edit it until you're happy.