Wattpad

There is an app called Wattpad, and its an app where people can publish books of their own writing online, and I really like reading the stories on there put out by other creative people. I really want to start writing a book or something to post on there, but I really don't know what, or what about. I want to write a love story or something, but I'm not sure what it should be about... I might start writing one soon. Hopefully an idea will come to me!