register a domain name, park on sedo or any parking affiliate program that allow porn, watermark your videos with your domain name, upload them to as many tube sites as possible, and don't forget to replace the final (cum) scene with something like "see full scene on "yourdomain.ext"
work: not much
fees: nothing except domain/s
revenues: more than 0
best niche (imho): fetish/bdsm (ctr is about 25/30%)