Pages 5.2-- Double-sided 5"/7" card??

I'm finding the new Pages 5.2 to be quite frustrating and not terribly intuitive. I'm trying to create a double sided 5"/7" promotional card for duplication. I already have the graphic and text designed; I just need to know where to make a specifically 5"/7" double sided card. I've googled the **** out of it and have oddly come up short. Any insights? Thanks in advance.

The only thing I can suggest is to check out the Mac App store. There are a myriad of apps that provide templates for Pages, some you pay for, others are free. I'm sure you can find a double sided 5" x 7" card type template to use. Either that or use another program that is easier for you to use. I personally do not do lay out work with Pages but instead use iStudio Publisher, $17.99 in the Mac App store.