My Equipment
Paper: Most important. Use the best you can afford. I use Arches and Waterford 300g (140lb). With bad paper your watercolour will not “sing”. The light comes from the paper. It is also easier to paint on good paper.
Brushes: Use as big as possible. A lage round mop #14 or bigger with a good tip. Lage flat "1, a round #12 (good tip) and a rigger #3. With these you do everything.
Paints: I use artist quality tube colours. There is more pigment in them. Good brands are Holbein (my favorite), Winsor & Newton.
Other: Holbein palette, spray bottle, creditcard (two purpus, one is to buy paper), knife, nail, what ever...

My Advice
DRAW, everything, everywhere
The water will free the pigment, use a lot of water
Indicate form and be aware of the tone. Tone is very important
Seek unity, conflict and dominance
Paint a story, paint a mode, paint a feeling
Practise, practise, PRACTISE...
Have fun!!