Forum:I've seen and love the movies, but I've never read any of the books. Which should I start with?

I have been a fan of the movies since 1977 when I was 10. For no good reason, I have never read any of the books associated with the larger Star Wars universe. Which of the series should I start with? I am particularly interested in reading them in some sort of chronological order. However I am open to hearing what others who know more than I suggest.