Artwork Needed

I am looking to get some 2d artwork done for a project that I am working on. I am going to need around 5 320*480 images created of cities, the Colosseum, a ancient village market and training arena. I also will need smaller (around 50*50 pixels) images created of various weapons. Like swords, lances, pikes, sheilds, knives, darts and a bow and arrow. There are aound 12 different weapons that need to be created. Each weapon will need to be created in wood, metal, gold, and a shiny diamond like skin.