Pencils, pens (your choice, but a variety of thicknesses works best)
Computer paper, thicker paper (bristol board if you have it), a sketchbook
Erasers and rulers if you want//need them. Scissors.
Good but not necessary to have a small bottle of black ink and a small paintbrush. You will be free for the most part to use any materials you prefer, so if you like pastels or watercolors, feel free to bring those to the workshop.
*The only thing absolutely needed is some kind of paper and drawing utensils.