When out of range, W and instantly Flash. AA then Q R instantly followed by an AA.
Use your trinket then instantly Q to extend the range.
To be a real sniper R then instantly trinket Q.
Use W followed instantly by Q and then R. Flash away mid R animation to create more space.
The most standard poke trade for lane is Q then AA instantly.
To burst after level 6, Q then AA W instantly. Follow it up with another AA and quickly R.
To trade from range use W on your target, then walk forward to AA Q AA.