Materials
The more pastels the better!
A great starter set is Prismacolor Nupastels. The minimum set recommended is 36 count.
Surfaces are important for pastels. Pastelmat by Clairfontaine is recommended. (A variety pack in several colors in 9″ x 12″ size is encouraged)
Other great pastel brands that are optional: Unison, Terry Ludwig, Sennelier.