To execute a low hp target E then mid animation Flash onto your target and instantly AA.
To surprise your target with a quick engage use E and as soon as you land W then Flash AA instantly.
For a style kill AA your target then E away and mid animation Flash back onto your target for an instant AA.
For a full engage W E instantly then AA once you land. Continue to AA until your next E comes up, then AA again.
Quick trade by hitting with an AA then instantly using E away.
When engaging from range E then instantly AA. Continue to AA and use W as soon as they turn away, then AA some more.
When in melee range AA then W, AA until you need to E to gap close or for the extra burst damage, then AA again.