To better guarantee you can knock a target into your team double tap Q instantly then Flash behind your target. Quickly R then W them as quickly as you can while they are still mid air.
For a super stylish engage Q, then right as it's about to release Flash R your target into the Q trajectory, then walk up and W them.
To knock a target into your team Flash behind them and instantly R then W as quickly as you can while they are still mid air.
When looking to aggressively engage Flash then instant double cast Q followed by AA W AA.
To trade on a target, use Q in fog of war, then walk up to W and AA. Recast Q and AA again.
For an extended trade, walk up to your target, E AA then W AA. Quickly Q twice and AA.
To engage on your opponent W then instantly cast Q twice followed by an AA.