Book ideas, anyone???

 Hi! I've just realised it's kind of weird that I am writing as if Loads of people will read this but actually only like 3 of my friends even know this exists! 

But AnyWAy!

So I am writing a book but I need your help (hello again, nonexistent readers!) for ideas. I actually want to send this to a publisher (those of you (See brackets above) who know me will know why this sounds unexpected) but I am not sure what to write about.

So far I have got that the main character is a duck who has the ability to enter another realm called the reverse world through a mechanical whale's mouth and everything in there is exactly the same as the real world but every colour it the opposite colour on the colour wheel... The duck goes exploring and fights mythical monsters but they're the only one in there so they're surprised to fine... someone... captured... 

I ran out of ideas there...

So yeah, that tiny number of people reading this, please comment with ideas! 

That's all from me now, bye!