Well, there are quite a few books so it will take awhile, but I recommend going back and rewriting a few. I decided to check out the Harry Potter one, and while the concept is good, it needs more detail. It’s good to list what’s going to happen, as that will help you get and idea of what to write, but lack of detail will lead to lack of interest. A good book has lots of details that describe how the character feel and think about the situation and what they would say.
And most of all, take things one step at a time. I’m amazed at your imagination, but do try to help the readers see what you see. Give them a way to see the world you see, and help them to envision it clearly.