Tatakae, tatakae, TATAKAE! (translated to english= Scale, scale, SCALE INTO LATE GAME) Play safe and poke with Mystic Shot level 1 and 2, level 3 look for Essence Flux + Arcane Shift combo. After level 6 look for midlane and toplane, and check if you can take a kill in with Trueshot Barrage.

Try poking as much as possible in early-game and look for a kill if the possibility shows up, but be really careful since you will be mispositioning much with Arcane Shift, mid-game look for picks with some teammates of yours, since yet you won't be able to one-shot someone by yourself. Once in late-game you can look forward to make pick ups yourself, since you can easily one-shot an ADC/Mage/Asassin at this point. In case you are going for the Two shot build then just look for pick ups the whole game, and poke as much as possible in teamfights, since you rarely will be able to one-shot someone in a 1v1.

Ezreal has no CC, so you won't be peeling your ADC never, take this in account. With the one-shot build you'll be looking to play as a one-shot mage, and with the two-shot build you'll play like a poke mage, if you are facing a fed enemy just try doing damage with Essence Flux + Mystic Shot and keep your Arcane Shift to escape