Designing / Making / Printing Your Own Cards

Has anyone ever had cards of their own design made... professionally printed?

I am thinking of scanning some of my cross stitch designs and sending the file to a printer and having glossy cards made. To start off with I'm aiming to have a batch of gift tags done. Just small 5cm square ones... but on a folded piece of card.... like the smallest size cards you find in news-agencies.

Do you think I'll encounter any problems?

I have called a printer close to me and they will be able to print off a jpeg file.

Is there anything else I need to consider? Should I design a logo for the back of the card? How does copyright come into effect? What if by chance someone gets hold of one of my cards and then copies it and sells it?

If anyone can answer any of these questions I'd be very grateful! :)