Instructions for folding your own book:

Take a sheet of paper, snitch a sheet from your printer for practice.
Bringing the long edges of the page together, fold the sheet of paper in half lengthwise. Open out again.
Bringing the short edges of the page together, fold the sheet of paper in half crosswise. Do not open out yet.
Fold each short end back to the middle fold. Open these folds out. Leave the page folded in half crosswise.
With a pair of scissors, cut in from the fold, following the crease from the first fold. Stop when you reach the next fold line.
Open out again.
Fold the sheet in half, lengthwise, again.
Holding one end of the folded page with each hand, lengthwise with the fold at the top, gently push the ends toward the middle. The center sections will (should) move away from each other to form two separate page folds.
Push the center sections both to the left to enclose the left section. Flatten all the folds.
Bring the single section on the right around to the back to form the front cover of your book. Flatten the folds.
Now you are ready to fill the pages. Enjoy!