There needs to be a sense of shared purpose.
I would think the easiest way would be to start a religious sect, as this would give you non-monetary legitimacy, akin to a modern day Mandate of Heaven or Divine Right of Kings.
Or if religion isn't your flavor, then some type of philosophical/political/national organization. However, I think it works better with religion because of the afterlife component.
It would also be best to get your followers when they're young. So perhaps start an educational fund that helps underprivileged families, with one of the requirements being to study your organization's ideology. Even better would be to fund multiple orphanages and have them run by members of your sect.