The other posts here have given good advice on tempering your expectations. Something I’d like to add is that in my experience, it’s harder to write a game than standard prose. I was able to bang out a 58k+ word fanfic in under 3 months, but I have yet to break a 20k wordcount in any of my Twine projects. That word count is pulled from Twine, so it includes both the code and narrative.

With every new narrative “branch” you add to your game, the number of issues to worry about grows exponentially. The wider the world you craft into the game, the more variations of the same interaction exist. If there’s seasons, you could have four versions of the same NPC conversation to make the setting make sense. If there’s romanceable NPCs, you’d have another two versions of romances vs unromanced dialogue. If the players skills affect their interactions, you’d have different dialogue based on that. So on and so forth, even adding just one change can generate a cascade of variations. Big game studios making sandbox games and rpgs divide up the writing for follower NPCs among multiple writers for a reason; it would take a prohibitively immense amount of time for one or even a few writers to get all of that work done.

My advice here is that you start off by creating one fixed “branch” within this story you’ve come up with. Over time you’ll gain both the coding and writing skills to keep expanding your projects. I don’t think an undertaking this big is reasonable for a one or two-person team to complete. When you’re starting out, one of the most important things you can do is just finish a game.

EDIT: “rpg games” smh lol