Some things to keep in mind while pvping,
Cancel
If you're trapped in a combo and know that your butts gonna get kicked, you can hold the "z" button and you'll get knocked down immediately so that cancels the enemy's combo.
(You need at least 1 bar of mp to do this, it will be consumed when done so)
Awakening Mode
To use "Awakening Mode" press "ctrl" when one of the circles in the top left-hand corner of your screen is lit.
When using awakening mode it will give you a small delay for you to execute a combo or skill. (So use it wisely) During awakening mode you will get a red aura around you, which will give you a buff that increases your stats for a certain time period.
Attributes
There are many type of attributes that can help you in PvP.
Fire - Will burn the enemy and damage them for a certain amount of time.
Ice - Slows down the enemy and lowers the enemy's defense.
Nature - Causes a weaker than fire DoT and slows the attack speed of the enemy.
Light - Petrify the enemy and cause some damage, when petrified the enemy's defense increases.
(Caution: May ruin your Combo!!)
Wind - Gives a chance to have an attack that adds 40% extra damage regardless of the enemy's defense.
Dark - Takes hp and mp from your opponent and adds it to your own.
You can put an attribute on your weapon at a nearby Alchemist Shop.
Techniques
You can continue a combo with basic attacks like "zzz>>^z" or "zzz>>^x" (elsword)
The point of PvP is obviously to deplete your enemy's hp.
But an easy way is to keep your combos going, try not to knock them down to soon.
(Look up tutorials to learn how to combo)
Don't be afraid to use your mp and think that you will mess up,
and if your hp is low run away, this is a strategic way of surviving!
*Tell me if theres anything to add.