Good advice all!
Get input from School first. Without their approval, you will be dead in the water.
Is it a Private or Govt Funded School?
If it is amiable with the school, then contact NPC Organizations or any others to get an idea of what needs to be done. Make sure, you are working with the School Activity Advisor to get He/She backing first.
Develop a Resume of what You want to accomplish, who you have, How many,what they are envolved in, GPA of said Group.
It is like looking for a Job, You must sell yourseves.
The best of luck to be sure. I did it and did not follow the rules. 40 Years later here We are!
If it is an Organizsation of National Status, are they Located in Your local area or looking to expand there.