Watch the first season. Look up the episodes that are fillers and skip them (do the same for Shippuden when you get to it). There are some things about the first part that I like over the second one, personally. It's definitely worth the watch, and there are some things that you do need to watch from it otherwise you'll be lost for most of the story.
Quote (Boblacolle @ 13 Mar 2012 00:35)
Wow what a way to spoil..
He obviously said he didnt saw the first part of Naruto, and you go and tell this? Nice call...
And btw, I suggest you watch everything except fillers.
If he watched the first part of Shippuden then he already saw the Sasuke part.