I want to write an E-book to make money off of online but I don't know which sites buy the books?

-I've been trying to make money online but can't find a decent way. Writing things for people seems good and I like and I am good at writing novels and other things but I can't find what websites I could sell them to or visit to sign up to. If you know a way to make good money online (no fake ones) , or anything to do with making money by writing could you please tell me all you know about it, thanks.