Here's a great video to learn two handed fair isle. It also teaches you how to catch the floats so they aren't so long. There is a sample project so you can practice.
After this I moved on to putting some fair isle in hats..just simple stuff to get the hang of it. It's fun!
ETA: You can purl with fair isle, but most people prefer to knit in the round with it.
ETA: Forgot the video... http://www.philosopherswool.com/Page...andedvideo.htm