Right now, the topics that are open are mostly business, entrepreneurship, teach and design, psychology and mental health. I'm not sure if fiction is a fit for this platform. As far as difficulty, there is really none. It's open for everyone, just like Medium you sign up, create your content and publish. You don't have to be a top shot on Medium to write on Tealfeed, so as far as barriers of entry there is none. I recommend that you head over to Tealfeed and check it out for yourself and then decide if this platform is a fit for you.