Paints
Tubes
For getting paint onto paper, tubes are best. Artist quality is better than students as they contain more pigment and your work will appear brighter.
Pans are more convenient to paint with than tubes, although for larger works tubes are better (paint pans were actually invented before tubes!! ).
STANDS
You don't really need a stand, any flat surface will do to paint on. If you do buy a stand, get a lightweight model.
On my stand I have a piece of plywood 5mm thick, dimensions 50cm by 35cm. I bought this from my local timber yard, I had them cut the wood to size. In fact, I had them cut out two pieces, why not, they only cost me a couple of quid each and a spare board is useful. I gave each board a coating of varnish to keep them waterproof when I stretch paper.
In hardware store you can buy plastic clamps really cheap, they're good for holding work, and being plastic, will not rust.
I also clamp a rag to my stand, this allows me to control the amount of water on my paintbrush.
You could hang a water container from your stand.
Sponge
Good for hedges, bushes, tree foliage etc
Rubber
When you rubout, a putty erasers will do less damage your paper surface than other types of erasures. This is important when you are trying to put down delicate washes. The pencil is a soft 4b, sharpened with a pen knife to expose more graphite to draw with.
Tissue
To lift paint or to create texture.