Every story must start somewhere. For me, the start is deciding to write a book.
That, I think, is the most important step towards writing a book. To decide this is a thing I'm going to do.
The next step is a lot harder, what to write about.
For me and this story, I do have an idea. Partially built upon vibes of a setting idea I like and media I enjoy. The setting idea I like is to take a fantastic world, a truly high fantasy world with all the towers, elves, wizards, witches, and all that junk and give them modern tech. Cell phones, TVs, food delivery services. It still looks like fantasy on the surface, but underneath is modernity. Kiki's Delivery Service isn't exactly the right comparison, but it is not too far off either.
But writing a story in such a world would lead to rather mundane conflicts without ruining the careful balance of the setting, but if I take it a step forwards and add in a bit of science fiction into the mix... then I can really start cooking and not worry too much about balancing all the elements because I have a whole lot of space for the consequences of someone with planet destroying powers to dissipate.
So my plan for this story is to, in the elevator pitch scenario, to have it be described as "Firefly meets Dungeon and Dragons".
For those of you who don't know what Firefly is, it is a space western show from the early 2000s that got one season and a movie and was amazing. Go give it a watch if you haven't because it is a show that still holds up today and still feels very fresh.
For those of you who don't know what Dungeon and Dragons is, it is the most well known tabletop RPG in the world and you should probably get out more, meet some people, make friends, maybe go to a gaming store and try it out.
For those who don't know what Kiki's Delivery Service is, it is a classic anime movie about a young witch striking out on her own and is a deeply moving work of art that deals with a girl's coming of age story as well as themes of depression, work related burnout, and creative motivation. It is my favorite Ghibli film.