1) Fold the stack of paper in half. Do not fold them one by one and then put them inside each other – instead fold them when they are stacked on top of each other all at once.
2) Punch three holes in the crease of the paper with your pushpin: one in the middle, two near the edges.
3) Sew. Here is a diagram:
And now you have a simple book. To make it fancier, use thicker cardstock for the cover, and lighter weight paper for the insides. I also attached a great pdf I found online about the pamphlet stitch and zines.