Basically I just read a lot of books and sometimes, I get inspired by them^^ I also read a lot of stories about Ryan on Wattpad and try to think about what hasn't been written before, what would be untypical for a Ryan-fanfiction and how I can make it different from the others, story-line and character wise. Sometimes also a lot of ideas just pop into my head because I'm just a typical day dreamer. I get distracted a lot because I always have these fantasies and scenarios in my head, and sometimes I try to think of how I could turn them into story material.
Just think about something that YOU would like to see in a story and what YOU would like to read, or what scenarios YOU would like to see happening in real life or what scenarios you would find interesting to see in real life! I hope that helped at least a LITTLE bit, I'm bad at explaining things and I feel like I can't put what I mean into words haha :D If you have any more questions, you can ask, I'll try my best to answer them ^^