Step 1: Getting Needles and Getting Started
Once you have your needles and your yarn, you're ready to cast on. Take the end of your yarn and pull it out until you a have a little bit of a tale. Make a slip knot by crossing the yarn over your finger and then pull the tale through to create a loop. Put one of the needles through the loop and pull on the tale to tightened but not too tight. Now wrap your finger around the yarn (not the tale) and pass the loop from your finger to the needle. Repeat this many times using your index finder. The amount of loops you make determine the width of your piece. But keep in mind you won't be able to see how wide it will really be until you've knitted the first row.
Step 2: The First Row
Step 3: Casting Off
For more information about knitting check out the book Knit Knit, by Sabrina Gschwandiner. The book profiles a lot of knitting artist and their awesome and creative designs. And don't forget to watch the Thread Heads episode for the full How-to!