first of al I want to say that this is the first build i ever created
and I want to excuse me for my bad english

I created this build because i think other builds aren't focussing on ad
witch I think is very important and easy to use if you use some lifesteal

hope you like my build

-first I buy dorans blade for the ad an hp (later in the game I sell it to buy a second bloodthirster)
-if I have troubles whit my hp i buy vampiric scepter, but most of the time i buy sheen
sheen is a good item for his passive: 100% bonus ad after you use a skill
-than i buy boots (later in the game i sell it to buy a second phantom dancer)
-after the boots i finish my trinity force, the zeal after you buy the trinity force your movement speed is about 410
-I buy the bloodthirster because i love the lifesteal, at this moment in the game I have crits of 700 and than the 25% lifesteal is very welcome
-I chose after the bloodthirster the phantom dancer for the movement speed
but, it's also great when you first buy the infinety edge for the extra ad an crit damage
-after you bought the infinety edge you have crits of more than 1000dmg on minions
-now you have your 6 item slots used, but i chose to sell the dorans blade and buy a bloodthirster, if you have 25% extra lifesteal you don't need the 100hp and the damage explainse itself
-at last i sell my boots and buy the phantom dancer, i think you don't need the cooldown reduction at the end of the game and the extra attack speed is always welcome

if you don't like this items and want some more armor penatration i would advise that you
don't buy the infinety edge and buy a black cleaver

if the enemy team has champions whit mutch hp i advise that you buy a madrad bloodrazor insteat of the phantom dancer

if you follow this guide, you can kill a champ like teemo or brand in 2hits