When you have max stacks of your Q, AA then instantly Q R and follow it up with AA W AA.
W then mid animation Flash and instantly AA.
R then mid animation Flash and instantly AA.
Make sure to instantly press Q after your fourth AA for a quick burst of damage.
Ult then walk into AA range and use W in between AAs - ideally while they are still stunned until you can proc your Q.
To easily trade AA then W before your next AA is ready.