What things do I use?
I use a Faber Castell bread eraser. Contrary to regular white erasers, it leaves no residue. It has the density of plasticine, so you can adapt it to your needs.
I use Prismacolor and Koh-I-Noor pencils, but the choice of pencil brand is not as important as with colored pencils or felt-tip pens. However, you should pay attention to their hardness.
As I mentioned before, the price is very important while choosing crayons. The best crayons are Prismacolor premier (about 12 pln per crayon) or Caran d'Ache Luminance (about 13 pln per crayon). There are also cheap crayons that will also work well, e.g. Giotto Stilnovo (about 2 pln per crayon) or Astra (about 1 pln per crayon)
Better quality markers, as in the case of colored pencils, are also expensive. One of the best markers are Touch (about 10 pln per marker) or Posca Markers (about 11 pln per marker). A cheaper replacement for these pens are their counterfeit versions, for example Touch Sketch (+- 0.60 pln per marker).
A pencil eraser is an item that may seem not very useful, but actually it is. It costs about 3 pln. It's best to equip yourself with an eraser that is not half and half with a pencil. The eraser will run out very quickly.