When outside normal range Q and Flash mid animation, then E before it lands followed by a W.
To get off a stun your target won't see coming use R Q instantly one after another then E before the Q lands. Use W while your target is stunned.
While being engaged on E then instantly R. Flash during the animation and instantly Q W right after.
For your basic post 6 combo E Q instantly then W R instantly and step forward so your R bounces to you then AA
For a mid range stun combo W then Q E. Instantly use R right after and AA.
To surprise stun a target Q and quickly E before the Q hits. Then W R as quickly as you can and AA.
To deal a bunch of AoE damage E W then instantly R Q and AA.
When being engaged on, E and instantly Flash to create some distance between you and your target. Q then W.
To perform your bread and butter combo instantly E Q your target then W after or as the stun lands.
To do some short range damage W your target and instantly E Q.