There are many organizations out there with varying rules and setup however the National Dodgeball League has a thorough rule set that most independent leagues have adapted and tailored to fit their own venue and or goal restrictions/missions.
www.thendl.com
www.arizonadodgeball.com
www.dodgeballislife.com
to name, but a few "serious" leagues out there.
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Click on the 'Circle Change' link on this page to learn the steps to throw the circle change up.
Due to the average size of a dodgeball, Your hand would have to be 3-4 times larger then the ball to effectively throw a change up.