premise: How to start a forum<br>Figure out what your specific niche will be. [substeps] Since this will be your forum, it is best to pick something in which you are interested and knowledgeable. Since there are already so many forums out there, it is best to have a defined niche.
hypothesis: it is best to pick something in which you are neutral and knowledgeable so many people will join your forum
reason: should be interested not neutral