I always recommend to my students that they use what they have on hand right now. All of my lessons can be adapted to your supplies and colour preferences.
Basic supplies that will be useful include:
Wet media: Acrylics, Inks, Watercolours
Dry Media: Coloured pencils, charcoal, paint pens
Painting surfaces: Whatever size or surface you prefer including, 300gsm paper, (minimum thickness for wet work), canvas, wooden panels, canvas boards