Take your cork and poke a hole into it. I used a pumpkin carving tool for this. Insert your wire into the hole.
Take your eye screw and screw it into one end, put your finishing nail in the other end.
Start wrapping the wire around in a criss cross pattern. I was lucky as my cork came with a criss cross pattern already inked on it! When you get to the nail wrap the wire around once, when you get the eye screw do the same thing and wrap it around once. Then hang on a chain when done.