While the story should flow in sequence from E1-E6, keep in mind that watching them in that order as a first time Star Wars watcher, he will have a different perspective on the event sthan you will.
By this I mean that a guy at work watched them as many of us did, starting with E4-E6 and then the prequels E1-E3... To him (and us) his point of view centered a little more around Luke, then Luke, whose father is Darth Vader... His son has the perspective from Anakin's point of view, with the story around Anakin, then Anakin becoming Darth Vader, then Anakin having twins (even though he doesn't know there is more than one child), and then the story of Anakin's son, and so forth.
Neither is wrong, or bad, but I just wanted you to be aware that his viewpoint will be different if you saw them starting with E4 and he starts with E1.
