Here are eight really simple and straight forward steps to tying a bow tie. Number six seems a little tricky, just shove the rear (the white end) behind the black end opposite each other. You should end up with an end and a loop on each side of the bow tie.
I came across this image on the RVR Neckwear blog. I have never owned any of their neck ties, but they seem like great quality silk ties. Thanks for the graphic.