Ok. There's a lot of questions I get about what supplies and tools I use to paint. I've created a video and compiled a list of materials that I prefer or feel are decent. It's up to you to decide if I know what I'm talking about or not.
Watercolors can come in tubes or pans of dry paint cakes. If you're just starting out you may want to consider getting a set of pans to get your first batch of colors. You can also build your own palette.
There are Artist Grade paints and Student grade. The difference is price and quality. Artist Grade paints tend to have more vibrant color, blend smoother and last longer. Student grade paints are made with more filler and the quality isn't top notch, but they are affordable and perfect for beginners.
Starter colors! (Just a suggestion)
Winsor Yellow, Cadmium Yellow, Alzarin Crimson, Cadmium Red, Cerulean Blue, Ultramarine Blue, Burnt Sienna, Viridian Green, Payne's Grey
These colors are a balance of warm and cool versions of the primary colors.
Whether it's fancy or homemade, look for a palette that is white so that you can accurately see the colors you're mixing. Most watercolor palettes are made of plastic. Any non-porous material works (glass, ceramic, etc.) If you think you'll be travelling, or don't have a permanent space to work at consider a smaller, portable palette. Some people like a round palette so that they can visualize the color wheel. The shape is all up to you.
If you're just starting out I highly recommend picking up a multi pack of brushes to get yourself going. Let's not get snobby. There are brushes out there that you could easily drop $40 on, but how will you know if it's the right brush for your needs?
When you put water on paper you want a paper thick enough to handle it. Water. I recommend paper that it at least 140lb (300 g/m2).
The texture of the paper is called the "Tooth". Cold press is a medium tooth paper while hot press has a smoother finish. You can get rough paper too, which has some extra tooth to it.
Papers come in single sheets, pads (wire bound or glue) or in blocks.
Hope this was helpful! If you have anything to add to this list leave a comment here or on the video comments. Thanks!