1) you normaly want to start with doran's blade and a pot so u can sustain early
2) then at the first back u aim to buy zeal so at your second recall u will probably be able to buy your Phantom Dancer
3)at your 3rd back u will probably buy a boots of speed or if better berseker's greaves
4)then u want to get a blade so u need to get either cutlass or the recurve bow.I believe the recurver bow is a better option since u have crit chance and u can get more hit on the enemy on the other hand cutlass is also very usefulll since it gives u a bit of lifesteal that u can mace use at 1v1 fight
5)If u reached easuly at this point it means u are ok andu probably are starting to deal dmg so its on you hand either to buy a bloodthirster on a infinity edge(personaly i .believe that infinity edge is better since it boost u crit chance at 100%)then after u purchase on of these 2 u want to purchase the other
6) then u can either purchase mercurial scymitar or a gurdian angel(which in the resent patch it got a diffrent item path with B.F Sword and a cloth armor).Also the before buying mercurial u will probably first buy the quick silver sash

1)if u are playing on the top side u want to get a control ward and put it on the tribush and one normal ward trinket at the bush near the lane at the river(on either teams either blue or red)
2)if u play mid u need to ward at the oval bush at the river since warding the line bush neat
the lane , there are ways which the jungler can get to with u realising

if u are not confident hit the tornado(2stack at q needed)
use e q for sure results if possible

in ranked play u need to pay more attention on the enemy jungler before anitiating and ward more shortly that in normal and dont be greedy