What to do to sell my own designs of greeting cards to Hallmark, American Greetings, etc.?

I design my own cards and everyone likes them so much. I’ve been advised to get affiliated with a company like Hallmark or American Greetings to sell my designs to and, automatically, start making money on my designs. But where do I start? Should I reserve my rights/copyrights? I will be grateful for any advice [...]

where can i get sample design for namecards, letterheads, covers, wedding cards, etc.?