Songbird,
Since I didn't use my own designs I didn't copyright. I also wasn't selling the designs or the molds. I am selling what I make using them.
I wish I could help you with copyrights. I am sure there is a site here on the internet. When I have done calligraphy in the past I did check with a lawyer to see what I could and couldn't sell.
Good luck on your venture it sounds wonderful and I admire anyone who can do their own designs.
Maggie