Source your paper. Matte black paper can be deceivingly hard to find — ours came from Kadmium Art Supplies in Broadway. You can buy it in large quantities online, so think about splitting a roll with your playgroup or consider black tissue paper as an alternative.
Get some pens. We tested a range of writing materials with varying results. Go for a felt tip if you want a crisp, easily controlled line, or pick a white pastel if you want that authentic, chalky look. A white gel pen is great for fine detail.