This was my first attempt at sewing a zipper. I ended up having to tear out and resew every single seam... I don't recommend using stripes on your first pouch, it drove me crazy to get them straight!
I went off this tutorial ( http://www.craftster.org/forum/index.php?PHPSESSID=c02d4c692e9495904f626de0e273c4f7;topic=22875.0 ) but changed it a bit. Instead of cutting two rectangles for each side, I used one long rectangle and folded them in half.