All vendors and models that sell any product, including their autograph, must obtain a New Jersey Certificate of Authority.  This allows you to conduct business in New Jersey.  This certificate is free and simple to get. Best of all, it can be obtained instantly online.  Go to www.state.nj.us/treasury/taxation, then to file online, then to the bottom of the page to registration, click on Div. of Revenue online business registration service, then to register a new proprietorship.  (A few of you will select the other option that refers to a corporation instead of a proprietorship.)  The certificate can be printed instantly.  No waiting.  No cost.  If you are without a computer, you can call 609 292-6400 (option 3) and request a Certificate of Authority.  The phone option takes 30 days.