so my girlfriend wants me to write a story on wattpad but i havent in a long while so i need a theme, plot,characters,character names,where it takes place and how many chapters it should be.

I'm guessing you're the kind of person who wants free art. I mean, I could legit make money out of writing a book. It's not in anyone's interests to give away plots that could pay bills. Sorry, kiddo.

There are random prompt generators online bro