Colors:

Winsor Yellow or Cadmium Yellow or Hansa Yellow Medium

Quinacridone Gold 

Burnt Sienna (earth color)

Cadmium Scarlet (beyond warm)

Cadmium Red or Winsor Red (warm red)

Permanent Alizarin Crimson

Mineral Violet

Ultramarine (warm blue)

Cobalt 

Cerulean (cool blue)

Winsor (phthalo) Green (blue shade)

Neutral Tint or Payne’s Gray or Black

Titanium White or Opaque White

Brushes: I like Silver Black Velvet round brushes, in different sizes and shapes. They are squirrel with a touch of synthetic. Start with a #10 round and a 3/4” oval. 

https://www.dickblick.com/products/silver-brush-black-velvet-brushes/

I like to use synthetic brushes as well.  Kingart Original Gold Brushes  rounds and flats, escoda-perla-toray-white-synthetic  I like the Escoda Perla 1/4” flat. It’s a stiff brush that’s good for lifting.

Paper: Good paper will take you a long way towards a satisfying watercolor experience. A few small sheets of high quality paper or 140 lb. 9 x 12” cold press block. https://www.dickblick.com/products/arches-watercolor-blocks/. 

Arches, Fabriano and Saunders Waterford are excellent brands.

Covered palette. This is the one I use. https://www.dickblick.com/products/mijello-fusion-airtightleakproof-palettes/?fromSearch=/search/?q=covered%20palette%20leak%20proof

An enamel mixing tray or an old white dish. https://www.dickblick.com/items/butcher-tray-palette-11-x-7-12/