You should, in most lane matchups, be aiming for first blood and the ability to snowball yourself. If you dont have your lane opponent at 50% Hp by levels 2-3 then you are playing too passive and missing your window. His early kill potential is heavily underestimated and many opponents will not respect it.
Take W level 1 : and abuse this ability whenever you can hit the minions, and your opponent.
Take Q level 2: This will allow you to close the gap on your low hp opponent. / also allows you to sustain a little bit if they are poking you back.
Take W again - or E: This one is a judgement call for myself personally. Ill double down on W if i dont get the kill by level 2, and i know i can get it during level 3.
Ill take E level 3, if i am concerned about the jungler, or if i flash under their tower for the early kill and need to leap away to safety.
If you landed a few W's level 1 then your opponent should be around 50-65% by level 2. At level 2 if your W hits twice, then Q in for the Kill - AA - then Ignite.
The bleed, electrocute, and ignite will kill practically any target.
From there you should be able to kill your opponent almost anytime they step up to cs and dont respect you, You should also be hunting the jungler at scuttle crabs, and raptors. Once you hit 6 + you should be roaming Bot for easy clean ups.