I come back to you to share this book
https://www.amazon.com/Emotional-Sensitivity-Intensity-Emotions-Sensitive/dp/1473656036
The phrases I wrote on the notebook are taken from this book. This book has been an inspiration for me.
i recommend freewriting regularly. if you are unfamiliar with the term, it's an exercise where you set an arbitrary timer (usually 15-20 minutes) and then force yourself to pour out words with no stopping, no backspace (no erasing if you're using pencil), no editing until the bell. there are a few things this does:
-it creates a mental "mode" in which you write and write and write, can't stop to think, gotta write!
-it gives you permission to write utter garbage. because until you've done this a lot, everything you freewrite will probably be complete garbage.
-it gives you experience writing utter garbage without anyone yelling at you for it. you can hardly even yell at yourself for it; the format of the exercise is hostile to writing in good form.
for freewriting, you might try the most dangerous writing app (https://www.squibler.io/writing-prompt-generator, select "start writing w/o prompt"). it will accept time limits in most practical 5 minute increments and if you stop writing before the bell, it erases everything. i enjoy using it for speeding through stuff in a blind panic sometimes.
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as for actually getting started... feel free to start in the middle, writing the scenes you most want to do. you can always write the first chapter, and edit in stuff to account for how the story changes as you go along, later. actually, two of my biggest projects worked this way, and the one that's complete ended up discarding almost everything i had written for it before the last draft, and that's okay because i wouldn't have gotten the story to the place i did without having gone through that process.