It is getting close to the date when you will start the PhD program. In most business schools, this will involve some initial prep-courses, like a math tutorial. You will most likely also have the Dean or the PhD Program Director do a presentation for you about the program, the statistics, the colleagues, and the achievements of previous students. This is of course valuable information to get you going. Myself, I think that giving an overall description of what a PhD entails must be a key part of the initial days at the program. So, I recommend that you take a look at the illustrated guide to a Ph.D. by Matt Might - how to explain a PhD program using pictures. I modified it just a bit to make it applicable to the different stages of the PhD program at INSEAD in the attached "PhD Welcoming Day" presentation in PDF format. Enjoy!