For 9Dragon players,here i will introduce a strong character build of Wu Tang, so I think everyone can find useful to know. So the trick is 2 points to dex per level and then 1 to cons and 1 to str.

Dexterity = Makes it harder for you to get hit, and gives you critical hits
Strength = Higher Defence for when you get hit and, higher attack damage make sure your max attack damage is high enough for your skills max damage and swords max damage.
Consitution: Your Health and your health regen rate.

Strength with Dexterity is a very powerful ally, but I reccomend having a decent amount of constitution as well.

Reccomendation for essence points, put points in sometimes at low levels but focus only on essence till maxmimum 20. I reccomend using elixers. Once you join Blue Dragon your Essence will drop a few levels so I reccomend maxing out elixers on your essence as well as some vitality boosting stats such as Frozen Tiger Ring. (Scroll quest for RC2 group of 3)

Which Sword style should I stick with Cloud swords or Wind Swords

Personally I find cloud swords to my liking with the bleeding damages but the stats on this style do alot less damage. Personally if you want to be a very powerful fighter its best to Master all sword stances and skills. Meaning you should try and get cheing 5 on all cloud sword stances and then switch to the highest Wind Stance which is "Double Shape Sword" from there take you pick of sword stances I like to go with this build of attacks on my hotbar. These attacks slow you down hit you with a powerful critical, or reduce attack rating which believe it or not in pvp makes the decision between the victor and the loser, and a personal favorite Bleeding. I reccomend focusing on any attack with high damage or the ability to reduce stats or add hp reducs like bleeding. With a build as I reccomended and a attack rating decrease debuff attack your looking at winning duels very easily with even just that.