When in melee range already you can chain your crowd control properly. AA W AA one after another then instantly Q E followed by AA R AA.
You can hide your R by using Q then quickly R mid dash. Right as Q connects and R is about to finish casting instantly W followed by an AA
To remove the time to react use R then instantly F Q W followed by some AA's.
Engage from much further away by using Q and R mid air then Flash mid R animation. Instantly W right after followed by some AA's
To burst opponents R then instantly W Q and AA once you land.
If your enemy already has stacks use E to stun and Q instantly. AA R AA, use W instantly after and continue to AA
Engage fights quickly using Q then hit R while still dashing and AA W AA as soon as you land.
Q and while the animation is still going hit Flash, instantly AA followed by W AA, use E as quickly as you can and finish up with AA R AA.
To reposition your W you can Flash during the animation. Auto and immediately Q afterwards followed by AA E AA.
This is your standard Q W combo. Use both together then AA twice, E as soon as you can then AA R AA
To engage normally use Q then AA and use W as soon as the animation finishes, AA again then E and AA once more