Is it best to fill this up as much as possible and leave Zazzle to automatically put on at the end for example “thank you card” or should that go mid title?
Zazzle doesn’t search descriptions but they are just as important as titles because Google does search them. According to View Insights, many of my products were found via Google search. That’s where descriptions really shine. Also the customer might read them. But even if the customer doesn’t, the Google bots do.
I’ve read that descriptions still aren’t searchable, HOWEVER, that might not always be the case, so you should get all your keywords into your descriptions anyway so you’re not crying later because you were too lazy to do it before!