W + W clears a wave after morello. (dont do this)
W the wave, E the casters and Q the front three will also get the job done. (preferred, saves a W charge)
lead with your E when attempting to kill someone, i know its risky but you need to make the decision right from the start whether or not you are capable of killing the enemy. you have 4 damaging abilities, most mages only have 3. E -> W -> Q -> R (and chase with R) is more than enough damage to kill any squishy at every stage of the game assuming you're full AP.
learn to aim Q, you either get this one or you dont, i happen to be great at math so this ability just clicks with me.
max W first, its better wave management. Q is decent for support vel for single target and to not shove your wave like a monkey support >.>
dont be afraid to just throw your Q out or stop it early in an awkward way, they might run into it trying to juke it.
your full R deals a solid 700 damage to enemies (after passive), thats a lot of the mid laners health, you can use it as a stand alone ability if their flash is down.