You might want to check out the following two articles in order to get a feeling what the school will be about.
For the course of Z.-Q. Chen, the first two chapters of Bertoin's book on Lévy processes is a good source for preparation.
There are notes by L. Silvestre on a previous course here: click.
For people not familar with the local regularity theory (Hoelder regularity, Harnack inequality) for differential operators of second order, chapter 9 in the book of Gilbarg and Trudinger is a good source.