Watercolor Painting Supplies

Paper:
140lb, Arches Watercolor Paper 

Masking:
Pebeo Drawing Gum

Brushes:
An affordable brush of decent quality is Winsor & Newton Sceptre Gold II Brushes 
I recommend an assortment of round brushes, but the minimum brushes that you must have is:
#6 Round
#0 Round
#4 Fan
Rigger Series 303, Size 3
Flat Wash, Size 1"
Robert Simmons Expression Brushes, Angle Shader, Size 3/4" 

Winsor & Newton Watercolor Paint:
Payne's Gray
Brown Madder
Burnt Sienna
Raw Sienna
Winsor Yellow
Aureolin Yellow
Winsor Red
Cadmium Scarlet
Quinacridone Magenta
Antwerp Blue
Cerulean Blue
Winsor Blue
French Ultramarine Blue
Cobalt Blue

Palette:
3036-1002 Blick Covered Palette
03066-1017 Butcher Tray Palette 13" × 17"

Miscellaneous:
02902-0001 Incredible Nib, Regular
toothbrush
some bristle brushes