ONE 8"x10" BLACK ACRYLIC PAINT SURFACE (See Several Options Below):
BLACK Stretched Canvas, BLACK Canvas Panel/Board, or BLACK Acrylic Canvas Paper  (( You may paint a canvas solid black using black acrylic paint SEVERAL DAYS BEFORE our class if you cannot find a black canvas in stores. )) 
(What are the differences in types of surfaces? . . . Stretched Canvas has primed (coated white) canvas stretched over a wooden frame & stapled to the wood.  Canvas Panel/Board feels more solid like the canvas is mounted/glued to a stiff cardboard.  Acrylic Canvas Paper is thick, coated paper that is flexible but won't warp and tear as easily as other papers and comes in a pad of multiple sheets.) 

ACRYLIC PAINTS:   (not tempera, not watercolor, not oil)
I suggest as least 1 ounce of several different colors including Blue, Red, Yellow, White & Black plus also Green, Orange, Purple & Brown although your child may not choose to use all those colors.  (Thicker acrylic paint in tubes are the best consistency for our painting techniques.  If possible, try to avoid using the thinner acrylics in plastic bottles that sound watery when shaken.)  

PAPER PLATE to use as a paint palette. (Optional to use a plastic paint palette instead or even a disposable pie tin)

ACRYLIC PAINT BRUSHES in a variety of sizes.  Include a couple of medium size ROUGH Flat Brushes (looks like a square on the tip but bristles are rough and a little prickly to the touch.  Also include a couple of very small SMOOTH Acrylic Brushes (1 very small Round brush like a pencil tip shape and 1 slender Flat Square Shape)  Please avoid brushes that are flimsy and bend when put under a stream of water. (Those are watercolor brushes instead of acrylic brushes.)

WATER in a metal can, plastic cup or glass jar (one that won’t tip over easily).

PAPER TOWELS

Please also see the attached photo that includes both types of acrylic brushes.