Pastel:  Wallis Belgian  linen or white, or Canson MiTientes touch.  Both available at Dakota art pastel
A drawing Board
tape
a 96 color set of NuPastels.  Only a complete 96 color set will do.
various soft pastels
I am partial to Terry Ludwig and Sennilier, but Great American,  Schmenke, and Unison will do.  Terry Ludwig darks are fabulous.
All pastels must be EASILY ACCESSIBLE. They must be orderly and at your fingertips.  You can't use, what you can't get to quickly, in other words, in front of you or toward your immediate side.  If you sit when you paint you can put them near you on the ground.  You can use a t v tray or stool to put your pastels on if you need to.
Outdoor classes need to include a good quality outdoor easel,  or pochade set up with easy access to materials.

Always remember a hat or cap, and plenty of water!!


Paint, either Oil or Acrylic:
High Quality brands!!!!!!  For Acrylic, that means Liquitex mediums, Utrecht Paints, Golden Paints  either fluid or tube colors.   Windsor Newton highest grade.  Please,  no Galleria or Liqutex Basics.  These are lightly pigmented and you can't achieve rich effects with them
For Oils: Avoid low priced oil sets. or anything marked, student grade. 

Colors:  Basic Colors, for either medium;  Titanium White, Paynes gray, Ultramarine Blue or Cobalt Blue,  Cerulean or Thalo Blue, Viridian or Thalo Green, Yellow Ochre, Yellow Medium,
Cadmium Red light, Quinacridone Crimson or Alizarin Permanent, raw umber, and burnt sienna.
Cadmium orange, and a violet will be very useful.


Artist who wish to underpaint in acrylic, need two  reds, a vermillion and a crimson  ie. Cad Red Light and  Quin. Red,  yellow medium , and  ultramarine and cerulean blue, plus black and white. .  Additional recommended materials for acrylic, or for underpainting in acrylic.
Liquitex white gesso, (a small bottle),   Golden Acrylic Glazing liquid gloss or Satin , and a liquetex clear gesso
 I also 'require' Utrecht Acrylic Titanium white.  No other white on the market comes close to its body and pigment.


Brushes.  I use Princeton Brushes  6300 series rounds and then a series of flat brights, large, medium and small.  However, If you have brushes that work for you, have at it!
I also recommend a couple of  Wooster foam brushes from Lowes,  for blocking in paintings.
A one inch flat, bright Princeton or Cotman Watercolor Brush with the clear handle is really a great brush for oils or acrylics.  Canvas panels from Raymar, Source tec, or wind river panels will be good.  Size depends on your experience level.  What makes you comfortablle.  A canvas that is too large can be intimidating, or too small can be limiting.