Luna moonfang / Moon rider

Your primary attribute is agility so buy items and recipes containing this attribute.
Try this, start with Ring of Regen then Wraith Band and Boots of Speed then a mask of death followed by a helmet of iron will (this makes helmet of the dominator).
After this all should be pretty easy and you will want to consider buy a manta style if you do not want the lifesteal anymore (consisting of diffusal blade, vitality booster)(diffusal blade consists of :robe of the magi, blade of alacrity and the recipe itself) I will explain why u should buy this item.

Lucent beam- lvl 1: 75 damage
lvl 2: 150 damage
lvl 3 :225 damage
lvl 4 :300 damage

Moon glaive- lvl 1 : 2 targets hit
lvl 2 : 3 targets hit
lvl 3 : 4 targets hit
lvl 4: 5 targets hit
(this is the main reason why would i recommend you to buy manta style and helmet of dominator...)(with helmet of dominator your life would nearly be maxed forever with the lifesteal... you can also choose to destroy your lifesteal and switch to mana burn with manta style you can take out all your opponents mana which is pretty irritating...) (manta style also grants the ability to form 2 images which last 10 seconds. This will help to grab your opponents mana away.)

Lunar Blessing [Level 4] An aura that gives friendly nearby units a 27% bonus damage to their ranged attacks. This is also a passive spell/aura that needs leveling early.
This and Moon Glave will be your primary focus as the damage will multiply fast and you will farm better naturally.

Eclipse: This skill relies on lucent beam for damage. It is like a multiply of lucent beams in 4's 7's 9's if your lucent beam is maxed, the damage for each beam will be 300, adding up to a total of 1200 damage if 4 beams (the maximum amount of beams that can be hit on an enemy) this is extremely useful if you have the ability to isolate your opponents early.

I've seen a professional get 18/2 k/d on zion before... that is why this hero is extremely famous and easiest to master...