Here's a link with information on how to protect yourself from con artists when selling your work. A lot of the information is common sense but here it is: http://www.artscams.com/
Also, don't forget to protect yourself in the studio. As most ceramic artists are aware, silica in clay dust can potentially be harmful to the lungs. Here's a link that briefly describes silicosis and prevention methods:
This link provides a little more in depth description of silicosis: http://www.merckmanuals.com/professional/sec05/ch057/ch057i.html