I began the process of making the clay drinking goblets by constructing the cup. I rolled four to five coils of the clay, all of them of approximately 3/8inches thick almost the same as the roundness of a pencil. Now these coils looks like long, snakelike pieces of clay. How should I proceed now? What is the rest of the procedure of making the drinking goblets? If I have made a mistake somewhere then please tell me about the right one.