When you buy the starting items in my build, keep farming minions then at around 10mins into the game, start to build your Deathcap you need the high AP to clear the minions fast enough so you can push the turret in your lane

By the time you reach mid game, you should have your boots complete, before you get the Needless Large Rod, Build the Deathfire Grasps, this will give you enough CRD to deal alot of damage to your enemies to help your team win the game

Once you reach late game you should have your build complete and be able to destroy the opppents easily without taking alot of damage to yourself and your team, this build should have around 300-500ap in total, this will help your team and yourself to kill people alot.

max W, E, Q, R, but do R at level 6, of course.