Discuss what this would involve in terms of money and materials. Remember that to work effectively, you need to be able to cooperate. You may be in a state or region with several well-developed groups already. For example, they could have a single newsletter announcing everyone's events and containing other news of interest. The three principles of credibility, open leadership, and outreach are all important in going to a regional organization.
Credibility is important so that the different branches in the organization can trust each other.
Outreach is important so that the group understands that its ultimate purpose is not limited to this city or that city, but truly to reach out to all the public, bringing them information about vegetarianism and vegetarians.