I admit now that this instructable was pretty trashy, so i'm gonna make a good english longbow instructable in a couple days.
Step 1: Materials
The materials list is as follows:
1.A long, straight stick about your height. Not bigger than about an inch and a half in diameter and preferably with as few knots as possible. Best woods would be hickory, elm, osage, yew, or certain types of ash.
2.String/cord. Preferably nylon cord or other strong, manmade materials that won't stretch out or get destroyed in wet conditions, but twine works too. I used kite string for it's strength and availability.
The only tool you absolutely need is a knife, but a hand plane is much better and safer.