Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
Start of with Doran's Sword and a health potion.
Go home and buy normal boots and a mejai's and if you have a extra 300 a brillience potion and start ganking. After another tour home you got 3 options. If you did extremely well go straight for a zonya's, if mid good buy a sheen and up boots, and if bad then get sheen only. If you did extremely well or mid good always finish zonya's 1st since its better and you get the 2 sec invurnability wich is op then go for the lich bane -> rylai's and luxury hextech gunblade. But if you did bad finish lich bane 1st then zonya's and the rest.
Always remember to buy a brillience potion if you have the extra 300 since it helps alot in the burst and will pay itself up in the kills you get or the assists for the mejai's stacks.
Gl & hf.