This watercolor materials list contains everything I paint with and use every time.
I do not recommend throwing out all your old
materials. I do recommend buying good materials in the future.
The most important material in watercolor painting is the paper. The
next most important is a good brush.
You can't paint good paintings with bad paper or flimsy brushes unless you really really know what you're doing. If you're an excellent artist, then you can paint with anything - there is no magic tool!
My lessons are always about making learning to paint easier and fun! Good materials are part of that.