If your printer feeds the paper though like this you don't need to flip the stack over, just feed them back in:
You should print a sample page to make sure everything is working as expected.
Don't waste 12+ pages with a full print! Instead download the test page, upload it to this utility and practice printing it to make sure you've got things figured out. This way your mistakes only take two pages each time. Download Test PDF When printing the booklet layout from the test-page you final results should look like this: When printing the two column layout from the test-page you final results should look like this: Be sure to set your printing options correctly. Both booklet and two-column use these same settings: