Judging 

This short slide show is a great place to begin:

This is a longer but more informative Video (CLICK HERE)

Here is a link to the Ballets and Rules for all Oregon Speech and Debate Events (CLICK HERE):

Accreditation is only required to judge the National Qualifier tournament but these videos are very helpful and informative and go into detail about how to a good judge for each event: 

https://www.speechanddebate.org/learn/judge-accreditation/