Variety of canvas panels; for instance 8x10, 9x12, 11x14 and 12x16 might all be appropriate.
Carrier for wet paintings (unused pizza box works well)
Paper Towels
Sketch pad & pencil
Assortment of brushes; I use hogs bristle filbert brushes; 2 #4, 2 #6, a #8, and a small detail brush, like a watercolor #0
Brush washer
Odorless Mineral Spirits (don't go cheap for the mineral spirits, get that from an art supply store like Meiningers or Guirys)
Palette for your paint (I like the large Masterson palettes, but a 12x16 painting panel covered in wax paper works fine)
Assortment of paints (student grade is fine):
Large tube of Titanium White
Regular sized Yellow Ochre
Burnt Sienna or Transparent Red Oxide
Ivory Black
Cadmium Yellow (hues are fine)
Cadmium Red (hues are fine)
Permanent Alizarin Crimson
Ultramarine Blue
Dioxazine Purple
Viridian
Permanent Green Light
Mirror (makeup compact is fine)
Plastic Gloves