Any of these papers: Hot Press watercolor paper or Illustration board, or a sketch book.
Pens: Derwent Line Maker, or Staedtler Permanent Lumocolor, or Staedtler Pigment Liner, or Micron Archival Ink.
Choose any pen; all come in different nib sizes from thin to heavy. Make sure they are waterproof.
Watercolor brushes, paint and pallet to mix colors.
BRING PHOTOS TO USE AS REFERENCE.
