Clays like Porcelain fire to a soft white with very little texture. These clays are what's called a plastic clay with better flexibility and no grog. This type of clay is more commonly used for tiny details, and fragile china. The white color of the clays when fired are great for applying glazes of all types. preferred by pottery and sculpture artists. Some clays lighter clays are preferred for easy shaping while other clays with additives like grog are better for throwing techniques and working up textures. Some clays fire to different colors or shades at different temperatures.
Clays like Stoneware are more commonly used, versitile clays for things like vases, dishes, potters for plants, and many other things. Earthenware and Stoneware are well known for their use in the classroom and in workshops for their wide range of working properties. Clay like Stoneware can have a wide firing range depending on the blended clays used. Kiln firing is measured in cone oxidation from 01-10 in correspondence with the heat of the firing kiln.
Creative Coldsnow offers many different firing clay types at low flat rate shipping costs. Considering these bricks of clay are, at times, 50 lbs a piece, they've made it quite affordable. They offer a wide array of clay products with high quality texture image close-ups of the non fired clay.
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Le Beau Touché & Le Beau Touché - HM: (Shop 
Armatures
No matter the modeling material you choose, if your final sculpture will be quite large, you will most likely need an 
Because clays are so pliable, it is easy to manipulate them with simple tools that may be fashioned from everyday objects. A bent piece of wire or different size nails are quite useful in shaping sculptures as are toothpicks and scissors. For more professional results clay tools are available. These tools are typically shaped wood or bent metal wire on wooden handles. Just a few will allow you to define your sculptures with precision.