This guide is geared to help students understand the basics of public forum debate. It overviews the entire debate, but does not provide so many details as to be tedious. I like to use it as a handout before starting the actual debates.
I read this guide front to back before I started teaching debate and I found it extremely helpful! It describes each speech and section of the debate in detail and let me gauge how to adapt a full debate for ELL students while keeping the integrity of the competition intact.
This curriculum provides a good overview of the basic debate skills in a logical and progressive order. For lower-intermediate I would stretch it out to 12 weeks or units. Several of the concepts are quite high-level.
This opinion article describes why debate is important and the skills that should be focused on and gained through debate in the classroom. It explores the value of debate, beyond public speaking and gives the teacher a better view of what to focus on.
This video gives great advice on how to be a good debate teacher and the unique classroom management skills it takes to teach debate. I would add that using visible, large timers helps with time management.
This review focuses on how to choose an appropriate debate curriculum. It provides insight as to which questions need to be asked when designing a debate course. It's definitely helpful to read before you design your course, and maybe as you go along.