A sketchpad (around 9x12 - something comfortable to carry)
Variety of your favorite drawing tools: pencil, three or more multiple colors of pens (Pilot, and InkJoy work great).
Additional supplies (we will discuss these the first day):
One piece of medium weight watercolor or printmaking paper 9x12 or larger (my favorite is Rives BFK printmaking paper)
Gesso (an 8oz bottle is enough)
1”-2” sponge brush or gesso brush