1 sketchbook, at least 9x12. Strathmore recycled sketchbook, 60 lb paper is a good choice.
1 HB pencil, 1 2B pencil, 1 5B pencil and one 8 or 9B pencil. They get softer and darker as they get higher in number. A 2H or 3H is a nice, hard pencil for really fine work.
1 stick of soft, compressed charcoal. Don't wear white while drawing with this stuff.
1-2 sticks vine or willow charcoal. This looks like a burnt stick.
1 white eraser
1 kneadable eraser
1 stump...this looks like a paper pencil and is really useful for blending both charcoal and pencil
So, all told, this is maybe $30 worth of supplies, may be a little less, a little more.