Materials List for classes with Valerie Isaacs: 
I shop online at Artist and Craftsman Supply, at Dick Blick, and Cheap Joes.  Email valisaacs@yahoo.com if you have questions not covered here.  
For oil painting:
Gamblin, Rembrandt, and Winsor-Newton are reliable paint brands.  You can mix all the colors you need from:
Hansa yellow deep or Cadmium Yellow Deep
Hansa yellow light or Cadmium Lemon
Alizarin Crimson
Cadmium red light
French Ultramarine Blue
Cerulean Blue
Winsor Newton Flake White Hue
and if you want to bring more, add...
Raw Siena
Burnt Siena
Yellow Oxide Transparent
Cobalt Blue
Viridian Green
Ivory Black
Titanium White
Portable Easel if you want to work outside:  Half-box Mabef is ideal, but any stable portable easel,  or a painting set-up you are used to is fine. 
4 canvases, no smaller than 12 x 16.  16 x 20 is a good size.   Fredrix and Art Alternatives are good and not expensive.  My favorite brand is *Masterpiece*.
Brushes:  Robert Simmons *Signet*, or any artist-quality hog bristle is fine.  3 each of #4 flat and #4 round,  #8 flat.  
Palette Knife:  I like Dick Blick RGM style 45.  Whatever you are used to, or a 1.5 inch elongated diamond shape.
linseed oil, Gamsol (a solvent safer than turpentine), blue paper towels from the hardware store, or cotton t-shirt rags, a jar to hold brushes, 2 wooden palettes (Richeson makes a good one), very small jar for solvent, a bag to carry supplies.  For cleaning brushes, I like Masters Brush Cleaner.   
A Sketch pad (at least 12 x 18) , vine charcoal and eraser.

If you prefer to work in watercolor:
You can get started with a set of oval kids paints, but only the *Prang* brand.  A 1/2 inch nylon flat brush, and container for water.   If you want to, add  a half-pan box with colors from the oil list above, and/or  cobalt blue, new gamboge, rose madder, cadmium lemon .
Watercolor block should be at least 12 in on short side.  If you are already set up with watercolor, bring whatever you have.    
For Acrylic:  
I am not an acrylic painter, but the principles of seeing will translate.  If you work in acrylics, bring whatever youve got.