I'm often asked about resources for CFI applicants. Here are a few resources that you might find useful. When I discover more, I'll be happy to list them here.
Rod Machado’s Plane Talk (The Mental Art of Flying an Airplane) - This is a MOST valuable book for helping you understand the psychology of thinking like a capable and safe aviator.
Rod Machado's (FREE) Private Pilot Flight Training Syllabus
Rod Machado's Private Pilot Ground School Slides for CFIs - Over 900 images that you can use in developing your lesson plans and in teaching ground school. These are for your use only and may not be transmitted electronically or displayed on any web site.
Rod Machado's (FREE) Nine-Week Private Pilot Ground School Syllabus for CFIs and BGIs.
Secrets to Checkride Success (web page) by Russel Still