Level: Aim Low, Charge Shot, Quick Shot, Frost Arrow, and the lightning arrows to the best you can
Then go for non-enhanced mobs on your quest and charge your shot. then use frost arrow and use normal attacks, when it gets close use the lightning skill to weaken Metal Res in the mob then use the lightning strike, then use Knockback arrow and follow that with Aim Low, then quick shot and it should die if you have them lvled up to your lvl with the best ammo you can use. or should be 80~90% dead, and you would have only lost 10~15% HP depending on your Armor and if it is HP or not. ^^
P.S: Carry a lot of MP Pots, you will need them to survive, even if people say archers don't use them.
Also try to get Armor that has the best HP Gems for there lvl, it will help you a LOT when you do anything (incase the cleric doesnt know what AOE Heals or Ironheat is) ^-^
Later levels (59+) you will find it much easier to kill mobs for your quests with the high Crit% and also the high% chance of a successful Stun or freeze
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hope this works for you, it has saved me a lot.