I like Usman's answer (+1!), but here's how I did it:
I wrote a book. 40,000+ copies in the field, and it's very technical.
People still react to the power of a physical book. Not an eBook, not a whitepaper, but a real, physical book. Books are sacred. Books aren't thrown away. Even though self-publishing is easy nowadays, people react as though it were published by McGraw-Hill.
It's possible for you to do it to because:
Probably the best way to start is to write whitepapers (for formal documents) and a blog (for everything else) and later cull it into a book. That way you get all the usual benefits of those documents and of working on the project incrementally.
Credibility must be earned.
Some steps that you could starting taking today would be:
Credibility takes time to be earned. The better the results and the level of transparency in your conduct the faster it will build up.