[Cory]

Poll local teams and see if there's even any interest in such a thing. If there isn't, there's no point.

Start small. It's a lot easier that way, and you can always grow in subsequent years.

Make sure you can have the full support of the admin at your school.

Those are all general things. you could talk to people who plan events like IRI, Cal Games, Battle Cry, etc each year to get specific advice.