Cool stuff, looks like with a few little mods this could work nicely for a rules light 7th sea game
Well, it does have an explanation on how to create your own Dueling Styles.
Okay here is some more detail about how they work.
Each style has 5 signature maneuvers. It isn't that these maneuvers can only be used by people with that style, but the style emphasises the use of these maneuvers. As you master maneuvers, you get better at the style, moving towards mastery. Normally, mastering a maneuver costs 5 Advancement Points. You can also take a Boon to begin with 2 Maneuvers mastered (a Boon is itself worth 10 Advancement Points, so it's equivilent).
When you learn a style, you take a Boon for that style. This includes Mastery of 1 Maneuver from the style and a "Style Benefit" which is some constant bonus as long as that style is used. An example would be a +1 to Initiative with the Eastern Style, or the improved damage the Italian Style gives with a Maine Gauche.
When you become a Master of a style (You've mastered all 5 Maneuvers; and yes, it is possible to begin play as a Master, by taking the Maneuver Mastery Boon 2 times and the Dueling Style Boon), you learn the "Final Secret" which may be something like a special attack, a free action, at a certain time, etc. For example, the Final Secret of the Spanish Style lets you spend a Fortune Point to Parry even if you have no actions remaining that round, while the Final Secret of the Old Style lets you get a free attack with your sword when you get a Mighty Success with your buckler.
The Styles that are already in the book include:
Spanish - A single rapier style emphasizing defense
French - An epee style that emphasizes flashy moves, usually with an off-hand weapon or cloak
Italian - Rapier and maine gauche style emphasizing offense
Eastern - A Saber style popular in Poland, Russia, Turkey, etc, favoring slashes
Drake's Style - A pirate style that uses a cutlass with an improvised weapon (like a hook hand, belaying pin, etc), and little concern for "fairness"
Old Style - Broadsword and buckler style that harkens back to the age of chivalry... but it ain't chivalrous
Highland style - Uses a claymore or basket sword to "make great room" around yourself
Smallsword style - Uses a smallsword, style emphasizes speedy thrusts and efficiency.
Halberd style - uses a halberd, mostly for defending VIPs (even if you must sacrifice yourself. Favored by the Swiss Guard)