You just have to know which page will be which, and print the top row upside-down, so they'll be the right side up when you fold it. In the above diagram, the solid lines are mountain folds and the dashed lines are valley folds. After you make the folds, cut along the red line and you'll be able to shape it into a book. You can then either use the 6 inner pages for content and pages 1 and 8 for the covers, or attach a separate cover.
I used origami paper (with the height trimmed) for the cover, the size of the paper turned out to perfectly match the length of the cover need, spooky :P ...Then I made a front cover image in photoshop, printed it out on standard office sticky labels and cut around the shape. The font I used is VTCorona, which I picked for its old-school typewriter look.