The easiest pattern is just to cast on to the width you want- skinny scarves are chic at the moment;
Then knit the first and all odd rows
Purl the second and all even rows
This will make a scarf with a front and a back.
To make it fully reversible: knit every row, or use a combination of both of these ideas to create several different bands of texture- and practice you skills. If you do it this way and discover a new stitch while you are still working on the scarf, you could just add a few inches of that stitch.
The easiest way to begin is with a medium to large size set of bamboo or wooden needles- they are less slippery,. and a smooth, light colored worsted yarn. Light colors make it easier to see what you are doing and larger- as in thicker- needles make the work go faster so there is a completed project and satisfaction.
Here are some sites with good ideas and videos:
http://knitandcrochetnow.com/
http://www.craftyarncouncil.com/
http://www.FreePatterns.com
http://www.knittingdaily.com
http://www.knitty.com