You really need more than this. The city I live in has an organization that helps non-profits develop plans for emergency situations (most likely earthquakes here). See
http://www.cityofsanmateo.org/dept/oes/firstaid/index.html
for our information. I hope your town has an office of emergency preparedness as well. Most communities have CERT/NEST/NERT or whatever acronym for community preparedness. See if yours has one, and take the courses.

See my page at
http://www.philipstripling.com/plan/Helpful_URLs.html
for links to FEMA's pages on preparedness, Red Cross, CERT courses nationwide, and so on.

If you've got that many people there, you need more than a satellite phone. See
http://www.philipstripling.com/plan/index.html
for some suggestions on how to get started.