Total gyms are awesome! There is a ton that can be done from a rehab and training standpoint. Facilities are usually supplied booklets giving all exercises and complimentary videos for Pilates and training depending on the type of TG and accessories.
A lot of Physical therapists also use them so you could possibly contact those people and observe.
Otherwise, I’d look online. I found the following PDF’s. You’d have to contact the company or look for the DVD’s online for more.
Not sure if there is any specific certification or training out there though.
Hope that helps and have fun.