As many artist quality soft pastels as you feel comfortable with. Colour range is more important than quality.
Assortment of papers: Art Spectrum Colourfix Original texture, Uart, Pastel Premier, Canson Mi-Tientes, Wallis (if you have it) or handmade support. (NO WHITE PAPER).
Your sketch journals.
Pencils, ruler, masking tape or clips
Easel and smooth drawing/backing board, cushioned with foam board.
Hand wipes/Paper towels.\Photos, reference you feel at ease with.
Selection of permanent ink BLACK wedge/chisel shaped marker pens the fatter the better.
Toned sketch book (I will use a Strathmore toned tan and grey)
A few tubes of gouache. White, Naples Yellow, Cadmium Red, Orange, Fr. Ultra Blue and a decent watercolour brush.
A sense of humor!!
I use mainly Unison, Great American, Ludwig, Schminke.