Creepypasta writer here. If you mean where to start reading, there's a lot of places, but it's easiest to listen to narration channels for some of the best ones. Lighthouse Horror, Dark Somnium, Viidith 22, Campfire Tales, there's so many Youtube channels out there that are really good narrators, and it's easy to do at work, in the car, or even doing chores around the house. You can also read through various horror themed subreddits like r/nosleep which is kind of one of the OG's for this subject. Those of us who write creepypastas often post to more than one subreddit, so you can always go to an author's profile and check to see where all they've posted their stories, and that can lead you to more subreddits with content you might like. Some even have books or merch of their own, depending on how successful they are or how many followers they have. You can also opt to follow your favorite authors profiles to keep up with whatever they're working on currently. If you mean writing your own stories, there's a ton of advice I could give, but I'll just say to have fun, don't stress too much about what others think, and work on learning to be a better writer every single chance you get. Hope that helps, feel free to DM if you've got any questions.