focus on clearing the waves at the back by using ur w. at level 3 you will be able 2 one clear the backline of the creap-wave by using your w because of the ap runes.

if you have problems hitting the skillshots you can ingage with your ulti. wait untill it has stunned your enemy so you can hit a easy shot with your other skills. remember that you are easy to get killed because of your lack of defensive runes you will have 2 keep out of the battle and use your e on yourself if u gets charged. if you don't get charged you but your adc you just shields him. at the end if you are chasing an enemy down its good to use your e on yourself to avoid any stuns