The biggest thing that I remember was the oral presentation portion. Be prepared to give a presentation (15-mins I think) on the system of your choice to the Program Manager for which you intend to instruct in, HR, Program Supervisor and someone from the Instructor Development department.
Also, it will help if you think of your initial instructor training as a marathon and not a sprint. I think 30-days total would be on the fast end of things. I used to part-time there and I enjoyed it very much. A really great bunch of people.
I hope that helps some.