What would be needed, how might it proceed? Here's a possible approach, offered more with hope for discussion than with intent to execute. ;-)
Start with a sub-forum. Its purpose would be to map out a plan of action and eventually get actual people to do actual things. Or, at worst, to make it plain to all that there's just not enough oomph behind it to go anywhere. As a corollary, advertise that sub-forum on other fantasy-related sites so others interested could join.
Among the things that would need to be planned and then created:
web site (where we can collect resources)
a formal organization (with cool acronym!)
social media presence
events (physical or virtual)
some measurable victories, including at the very least some publications by authors
eventually, maybe, mechanism for membership fees
our own forums
and in general, all the stuff one can find at the SFWA and RWA web sites
So yeah, it's pretty huge. But it can be tackled incrementally, and one ought never underestimate the power of the crowd.
If you want my advice, I think you're thinking over your head by more than a little with this.
Here's what my advice would be:
- Start with a cool name, a point-person, and a group of 3-4 people willing to work on it.
- Put together a list of people on Mythic Scribes who have self-published works available, maybe with a thread asking people to post information about their works, and the OP kept updated with a list.
- Figure out how much information self-published people need and the best way to organize it. Put together a few starting pieces. Ask Black Dragon if he would host it, and if he would offer you a forum to create the material.
- Put together a standing page on Mythic Scribes listing everyone's self-published work, alongside the material you've put together.
- Set up a twitter / social media accounts and get your volunteers to tweet funny things while promoting that page.