Sorry to respond so late in the game. My alerts must have been turned off.
I have found the following titles useful when I start working with new transcribers. I use them mainly for adding to their experience and more information. Hope they help you. The following are available from AFB Press. You can Google their site and visit their amazing bookstore.
When You Have ... Series
When You Have a Visually Impaired Student in Your Classroom
When You Have a Visually Impaired Student with Multiple Disabilities in Your Classroom
When You Have a Visually Impaired Student in Your Classroom: A Guide for Paraeducators
Hope I am not too late to help.