Hi! Welcome to the site!
I think that a lot of writing is basically, 'write what you know.' For me, it's more, 'write what you enjoy reading, or what you want to reat.' Speaking from experience, though, I'd advise not starting off with something really complicated. That's a trap I've fallen into multiple times, and why I only have one finished (not great) storygame and a multitude of started ones that will likely never be completed.