The easiest way is by using iTunes. You don't have to buy music from them but the iPod is made by Apple and so is iTunes so they work together nicely. You can load your own music from CDs onto iTunes...
well you can try all the combinations :)0000-0001-0002....until you get it right :Dthere's nothing else you can doeven if your restore it or reset it, when you turn it on, you will find the "insert...