There are only a few mediums for pastel painting as this technique is generally a puristic painting technique. The mediums suit for priming as well as for final treatment. The several primers allow pastel painting not only on pastel paper but also on different surfaces. The essential mediums for pastel painting are certainly the fixatives which protect the artworks.
Pigments in general suit for colour production. The suitable binders for making your own colours (oil, acrylics, gouache, watercolour, linoprint) you will find here.