Sandstone is a solid block. It is found naturally at the bottom of sand stacks, and can be crafted by putting four blocks of sand in a square. Hence creating sandstone does not require the use of a crafting table.
Chiseled Sandstone is a kind of sandstone with various small carvings on it. It can be crafted by placing one sandstone slab on top of another in your inventory crafting. (However, the sandstone slabs themselves would need a crafting table.)
Smooth Sandstone is a kind of sandstone with a smooth looking texture. It can be crafted by placing four blocks of sandstone in a square in the similar way of Sandstone and Chiseled Sandstone, it can be crafted in your inventory.