Hey guys :) . This is my first guide. Im havent got that many experience in LoL and also i only got to level 13. But i played with Master Yi all the time and i can say that my item build wont fail most of the times. Hope you enjoy and have much succes :) . HF & GL!

The lane is not so important, but i cant recommend SOLO MID!

PS: Im from Germany and i tried to speak English as good as I can :) . My german Guide you'll find here:

This guide will only work if you wont die more than 2 times in the early game. Be CAREFUL and wait on team mates. It needs some Yi experience and practising.

Boots of Speed = To be long on the lane. Don't play too aggresiv!!!
Berserkers Graves = Some attack speed for the early game.
Longsword = If not enough gold, buy the Ruby Crystal first!!!
Ruby Crystal = Gives you some health, that you can stay longer on the lane
The Black Cleaver
Vampiric Scepter
The Bloodthirster = Now you are strong and you can slay enemys. You also have enough health to run away if it wont work.
Dagger = Some more attack speed.
Brawler's Gloves
Zeal
Dagger
Phantom Dancer = You are getting stronger and stronger. Now you have a balanced system. Enough damage, health speed.
Giant's Belt
Warmog's Armor = You look like a tank, but you have much damage. Now you can dive a tower without problems and you can help team mates. But more important is, that you can fight an enemy easily, also if you are alone!
Longsword = The rest is only some more strengh, but most of the games will stop earlier, so you havent got time to buy all these.
Ruby Crystal
The Black Cleaver = If you have bought this, you did everything right and you are unstoppable ;) !

Meditate = Helps you to stay long on a lane! Kill as many minions as possible, but be careful!
Alpha Strike = Now hurt your enemys and run away. Repeat this!
Meditate
Alpha Strike
Alpha Strike = Now your Alpha Strike is very strong. You are able to kill Champs.
Meditate
Wuju-Style = You'll need it in combination with the Highlander
Highlander = Now here is the most importent thing to kill an enemy:
First you use your Alpha Strike to get near to the enemy. The enemy tries to run away. You use your Highlander and your Wuju-Style at the same time and that will slay your enemy.
Wuju-Style
Meditate = The last time you upgrade your Mediate since you are level 18. Because in the end game it wont be useful, because it wont bring much health.
Alpha Strike
Wuju-Style

Now you can decide on your own, which skills you need more. On the Abilities List you can see more.