This is my first guide. I tried as best I could. In my guide, I will discuss several things such as the selection of Items, Spells, Masteries, Runes, Skill Sequence.HAVE FUN AND A LOT OF KILLS!

Xin Zhao is a Melee Fighter, has a high attack rate and movement speed. Very good farmer in early game he are the Beast. Mid and Late if you are farmed or feed you already win the game.

Whenever Jarvan III, the king of Demacia, delivers one of his rallying speeches from the glinting marble balcony atop the Royal Palace, Xin Zhao is at his side. Coined the Seneschal of Demacia, Xin Zhao is the personal steward of the Lightshield Dynasty. His enigmatic, silent vigil has led to an abundance of conjecture concerning his “secret life” and origins. Whether it’s "Zaun double-agent" tendered at the dinner table or "indebted rune mage" mused in the editorials of the Demacian Constant, Xin Zhao betrays no hints to sate the curiosity of the masses…for good reason.

Prior to the formation of the League, Noxus was renowned for a spectacle called The Fleshing. It was a gladiatorial event with a cruel twist: as a fighter won matches, his number of opponents (generally prisoners of war) fought simultaneously would increase. This meant eventual death for every contender, but with unparalleled glory. Xin Zhao, known then as Viscero, was slated to face 300 soldiers, nearly six times the previous record. This was clearly meant to be his final match. Jarvan II, hearing of this unprecedented feat, infiltrated the arena to offer him an alternative: serve Demacia and punish those who ultimately sentenced him to death in exchange for his freedom. Xin Zhao accepted, astonished that a king would risk his own life on his behalf. Under the cover of a prearranged Demacian assault on Noxus, Jarvan liberated Xin Zhao and his 300 opponents. During their retreat, Xin Zhao took a poisoned dart meant for Jarvan. This act of loyalty, from a man who vowed no allegiance, earned Xin Zhao a spot at his side until the day the king died. Now in the service of his son, Jarvan III, Xin Zhao is stepping into a new ring – the Fields of Justice – to fight for his adopted country and to honor the legacy of the man who gave purpose to his life.

I take Armor Penetration Mark because this Runes are monster combined with Black Cleaver.
Greater Seal of Alacrity (Attack Speed) because Xin Zhao is mainly based on the rate of attack.
Greater Glyph of Celerity (Cooldown Reduction) Becouse without items CDR Xin Zhao must wait for he skills too long.

I chose this because it is based primarily on the offensive and slightly increasing armor and health.

Passive: Tireless Warrior

(Innate): Xin Zhao is healed for 25 / 30 / 35 / 40 / 45 / 50 / 55 / 60 / 65 for every 3 attacks that he lands. Natural Life Steal? I GET IT!

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Q: Three Talon Strike

(Active): Xin Zhao prepares to unleash a fearsome combo, causing his next 3 standard attacks to deal bonus damage with the final attack knocking his opponent into the air.
Physical Damage: 15 / 30 / 45 / 60 / 75 (+1.0 per attack damage)
I maxed it first.

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W: Battle Cry

(Passive): Xin Zhao has passively increased attack speed.
Attack Speed: 20 / 25 / 30 / 35 / 40%
Cooldown: 24 / 22 / 20 / 18 / 16 seconds

(Active): Xin Zhao unleashes a battle cry, doubling his passive attack speed for 5 seconds and causing his standard attacks during this time to reduce all of his other abilities' cooldowns by 1 second.
Maxed it last

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E: Audacious Charge

(Active): Xin Zhao charges an enemy, dealing magic damage and slowing all enemies in the area for 1.5 seconds.
Magic Damage: 70 / 110 / 150 / 190 / 230 (+0.4 per ability power)
Slow: 20 / 25 / 30 / 35 / 40%
I maxed it in second place because that can harras enemy and combined with Q are very very good combo.

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R: Crescent Sweep

(Active): Xin Zhao executes a fierce spear sweep on targets around him, dealing base damage + 15% of their current health in physical damage. His armor and magic resistance are boosted for 6 seconds by 25 plus a bonus per enemy champion hit.
Base Damage: 125 / 225 / 325
Extra Armor & Magic Resistance: 7 / 10 / 13 per champion hit
Very good ulti give Armor and Magic Resitance for 6 seconds by 25 per enemy champion hit. I take it normaly at level 5,11,16

Exhaust : I think this is the best Summoner Spell on Xin Zhao. Reducing oponent Movement Speed, and attack damage dealt by 70%. This spell Xin Zhao MUST HAVE!

Ghost: Not very important like a Exhaust but in conjunction with it gives a deadly mix and if oponent don't die he must be a very very lucky.

Alternatives:
Teleport : Replace Ghost. If you are too slow to back on you lane you can get this. This spell are good to gank. (Vision Ward on the brush AND GO! :>)
Flash: Replace Ghost. Good spell to avoid the gank. I prefer Ghost but what about who likes.
Ignite: Replace Exhaust. Good on early game to finishing off oponent. As previously preferred Exhaust but whatever you like.

No take this skills:
Clairvoyance: You are not a Support.
Smite: If you go to Jungle. But Xin are good on lane.
Heal: He have natural Heal and Life Steal from the items i never take this on Xin.
Fortify: Anyone get this? :O
Revive: If you dead in the teamfight you can take this but You NEVER DIE! :>.
Clarity: No. No. No. And another NO!
Rally: You don't need this you are Xin Zhao!

ITEMS:BOOTS

Berserkers Greaves: They give us additional attack speed so this is very important on Xin Zhao

ITEMS:MUST HAVE

The Black Cleaver: This is the first of them you must have this on Xin Zhao. It give to us: 55 Attack Damage, 30 Attack Speed. UNIQUE Passive: Physical attacks reduce your target's Armor by 15 for 5 seconds, (maximum 3 stacks). With Q are the best item.

Phantom Dancer: Very Important item give to us: 55 Attack Speed, 30 Critical Strike Chance, 15 Movement Speed Multiplier. You need this and this with combine with Infinity Edge, Black Cleaver and Bloodthister is unstopable force.

The Bloodthrister: Life Steal and Attack Damage who want more? It give to us: 60 Attack Damage, 12 Life Steal. Passive: Gain an additional 1 Physical Damage and 0.2% Lifesteal per kill. Maximum of +40 Damage and 8% Lifesteal. Bonuses are halved upon death. You with this guide be the killer so this can help You.

Infinity Edge: Attack Damage, Critical Strike Chance and Critical Damage?! It give to us: 80 Attack Damage, 25 Critical Strike Chance. UNIQUE Passive: +50% critical strike damage. I don't have any questions i GET IT!

Guardian Angel: If You die You have another chance to retaliate. And give Armor and Magic Resist very good item. Give It to us: 68 Armor, 38 Magic Resistance. UNIQUE Passive: Revives your Champion upon death, restoring 750 Health and 375 Mana. This effect can only occur once every 5 minutes.

Pros
+ Fast!
+ Natural Life Steal
+ Good Farmer
+ Deadly Combo (W,E,Q,R)

Cons
- He don't have natural gank avoid
- He loss against Range Oponent