I can't draw, unfortunately. The way it works is that I send a manuscript into the publisher then, if they accept it, I work with an editor to make it as good as I possibly can. Then it's the publisher's responsibility to get it printed, get whatever artwork is needed done, get it printed, and sell it to bookstores and libraries. I get an advance when we sign the contract. Then, when the book is sold, I get royalties.
Royalties are a percentage of the cost of what the book sells for.
So how much money I make depends on how many of my books are sold. Another question that's usually asked by a nine or ten year old boy. By writing and writing and writing until your work is good enough to be published. Then you find out what publishers publish the kind of book you have written. You can look at newly published books in bookstores and ask librarians.