Guys I need help!!

I'm planning write a book. I have lots of ideas, but what bạn want to read? I have ideas for a fantaisie story whith ghosts, monsters and whith a big secret. The main character is a girl who sees the monsters and ghosts. Her parents died in an accident and she live with her grandma. And one ngày the darkness came into this village. And I don't know it's a good theme?