Before hunting, remember to equip your weapon and armor in the Inventory. Mystics should also remember to drag and drop attack spells to the shortcut bar for quick access.
Hunting with Weapons
  Generally fighters will do battle in close combat. Simply click on the target to select, and once more to attack.

Sword, knife, and blunt types are close range, and only players with bows may automatically attack from a further distance. Bows consume arrows and MP, but may inflict a greater damage comparable to magic skills. Unlike spells, bow attacks cannot be cancelled.

Fighters who reach level 5 or higher can learn active attack skills.
Hunting with Magic
  Mystics are far more efficient in battle when using magic spells. First, add skills to the shortcut bar. Click an opponent to target, then click the corresponding shortcut key to use the magic spell against your opponent.

Magic has strong offensive power, but there are a few things to keep in mind. First, when using a magic spell, there is a delay before being able to use the next spell, and movement is not possible during spell casting. If attacked while using magic, the spell has a chance of being cancelled. Mystics should avoid direct physical contact with opponents if possible.
Useful Hunting Tips
 
About PvP

The Lineage II PvP gameplay is based on a color-coded system. The name of any character who attacks another player turns purple (Aggressive), and this also applies to anyone who attacks an Aggressive player.

Players do not receive penalties for attacking and defeating Aggressive characters. However, when attacking and killing characters that are Neutral (white colored names), the player's Karma points increase and the player becomes a Chaotic character. Chaotic character names turn red, and the guards of any village will attack a Chaotic character whenever they come in contact with one. Chaotic characters cannot use shop services, and have a high chance of dropping items upon death. To reduce Karma back to 0, the player must hunt monsters. There is also a quest available that can reduce the number of Player Kills a player has earned.

Combat Points (CP) are consumed through PvP. The CP total varies by class, recovers over time, and acts as a buffer that must be depleted before damage will affect the player's hit points.

Acquiring Skills
When a player hunts monsters, he/she may obtain experience points and SP (Skill Points). SP is consumed when the character learns a new skill, and can be viewed from the Detailed Status Window.

Fighter classes may learn new skills at level 5, while mystics can learn new magic spells at level 7. Go to the fighter guild or mystic guild in the village to learn new skills and magic.
Shields
Physical defense rates do not increase merely by putting on a shield. But when a character wears a shield, the character may randomly defend against enemy attacks according to the shield's ability. Successful shield defense leads to decreased damage depending on the shield's ability.

However, keep in mind that evasion skills decrease when wielding a shield. This may be particularly significant for dark elf mystics, for whom evasion is a necessity. For certain classes, wielding a shield may actually be a disadvantage in battle.
Potions
HP does not instantly recover when a potion is taken. It takes some time to recover, so it may be wise to use potions before or during a battle. 
Accelerating Magic
Mystics only have increased spell casting speeds when wearing magic caster upper and lower body clothing.

When a mystic wears fighter type equipment, physical defense rates increase, but spell casting speeds are reduced by half.
Item Drops
When a character dies, random items in the character's possession have a chance to fall to the ground for anyone to loot. The drop rate for items that are not being worn is higher than items that the character is currently wearing.

No more than five items are dropped at one time, and characters with high Karma (Chaotic characters) have an increased item drop rate proportional to their karma levels.