Login to your RevelDigital account and check out the Template Gallery where you'll find a new menu template creatively titled 'Menu 2'. You'll notice two zones named 'Left' and 'Right' which represent placeholders for the Google spreadsheet items. Any number of these zones can be added to the template each of which can contain any number of menu items. Feel free to tweak the template background, playlist, etc to match your own creative requirements.
We've provided a knowledge base article with a step-by-step so please check it out here:
http://support.reveldigital.com/kb/advanced-topics/google-docs-integration-menu-board