Choosing a fighting style that works for you is a very personal thing to choose. If you ask, many people will tell you they feel more confident using a particualr fighting style. The most popular in GOA are:
I will not go into Missile Weapons as they take aiming skill which is better taught by practicing aiming. (Actually all fighting styles are better practiced by going out and doing them.)
In choosing a style consider the following:
Would my CHARACTER use this weapon style?
Is this a style I believe will work WITH my natural abilities such as quickness or stamina?
All these things are important and should be considered when deciding what weapon style fits YOU best.