Many thanks to Amy Snow who posted some of these resources on the Trainer-talk mailing list including a course which she taught which you can watch on Youtube.
ACVREP AND GOOGLE LAUNCH THE CHROMEBOOK ACCESSIBILITY TRAINING PROGRAM
Various Chromebook Accessibility Resources
ChromeVox: From Basics to Mastery – YouTube
Chromebooks – A Journey in Productivity | Mystic Access
A World Of Chromebooks – Mystic Access Downloads
Podcast Transcript: Mosen At Large episode 155,
Note: Many subsequent Mosen at Large podcast episodes cover additional ChromeBook features.
Please note that I am not a ChromeBook user and so I cannot answer any additional questions or provide support.