There is no set order as such with which to use the studies. I have deliberately avoided grading the studies in terms of difficulty, as they all offer something to players of all ages, abilities, and styles. The studies are written with a 4-piece set in mind but can easily be adapted to (much) larger setups.
Drum tutor and eternal drum student. Author of the Freedom Within Structure series of books. Contributor to Modern Drummer, Drum! and Music Teacher magazines.