There are a number of excellent online tutorials available that show how to tie turks head knots.
Here are a few of my favorites:
The Golden Knots site "
5 lead x 4 bight click here
7 lead x 8 bight click here
both illustrated with still photos by Loren Damewood
Jan Brett's Sailor Bracelet site is a nice simple single page illustration of how to make a classic three part rope bracelet. This would be a great project for kids on a rainy afternoon.
Alan Folsom's knotting page is another great source for instructions on tying turks heads. How to Tie a Turkshead will get you started.
Animated Knots by Grog has a great animated sequence showing how to tie the basic three part turks head also know as a "woggle" by the boy Scouts.
Stormdrane's Blog has a video that will get you started on a bigger project.
One of the many video tutorials showing how to tie a simpler 5 x 4 knot
Disclaimer: Now this short listing is not complete. I'm sure there are a number of other sites with instructions and illustrations not to mention the large number of crafters and old salts who make and sell a wide variety of things nautical. Please feel free to leave messages with additional references or comments.