There's a few translations of
Book of Five Rings out there. I own a copy translated by -- if I recall correctly -- Thomas Cleary (my book is unavailable as I only have internet through my workplace). Unfortunately, there's not a LOT that can be learned by just reading the book. Some basics are applicable if you also have a sensei to help you through.
May I suggest any books and videos you can root up on Aikido and Kendo? Both have Katana-based combat teachings, and Aikido teaches Jo Staff, which can sometimes be used like a saber (may actually be better for Saber combat since a stick hits like a stick no matter which way ya swing it, whereas a sword is only REALLY effective when swung in a couple directions). Kendo and/or Kenjutsu, I've heard, was the basis for the original trilogy's combat style, albeit heavy on Flynning (
http://tvtropes.org/pmwiki/pmwiki.php/Main/Flynning has this to say about Star Wars in particular: "The lightsaber battles from the original Star Wars trilogy, dubbed "budget kendo" in some circles. The original idea behind the lightsabers was that they were difficult to handle, which limited their choreography to mostly slashes and parrys [sic]. For the prequels' George Lucas specifically stated that the battles of the original trilogy were fought by "old men, feeble cyborgs and young kids" and he wanted the prequels to highlight a more sophisticated fighting style. They are more technically impressive and faster paced, but still use common tricks associated with flynning...").
That being said, the edition I have also adds a second book by a fella by the name of Yagyu Munenori, who was a combat arts teacher for the Tokugawa while they were in charge -- Ieyasu and his son, I believe. AHA! Found him on Wikipedia! He taught Yagyu-Shinkage Ryu (The other official Tokugawa family style, according to Wikipedia, was Itto-Ryu) and wrote a book titled
A Hereditary Book on the Art of War. That may be what's in my
Book of Five Rings. It mentions three chapters: "The Killing Sword", "The Life-Giving Sword", and "No Sword". It comes highly recommended.
I personally feel like Yang-Style Tai Chi could be adapted to lightsaber combat. There is a sword form, based on the chinese
Jiann, or straight-sword.
... Gosh, I ramble on like C-3P0, don't I?
