I don’t read fan fiction (feels odd). I outline and then depending on whether I like how it’s going, I keep going with the outline or I chuck pages and rewrite the outline and go on.
I would say don’t expect to make a living off it. If it happens, great, but writing and finance are not compatible, when I decided to be a full-time writer I also told myself I would be happy being poor. I feel very lucky, but I also never expected to make a living off it. I always thought I’d have a day job.