Your Q is a good farming tool and "poke" to scare the enemy from getting too close to you and is best triggered when they try to last hit minions.

Your W is a great escape and is the bane of the "click to win" champions. It uses a lot of energy so use wisely and sparingly.

Your E is another good farming tool, just don't overuse it and be out of energy to fight when the time comes. It can activate your Q on hit to deal extra damage too.

This R is a great Ult and you get 3 of them to boot! It can help close the gap between you and the enemy, escape to minions/camps while being chased and to top it off you get one back every kill/assist. It can really help with people that run when you put your Q down as it also activates it.

Q-R-Q-E
The shroud isn't too much help when full out attacking the enemy because of its high energy cost and is more of a escape/bait.

1. Lay down a mark and wait for it to cooldown somewhat (Q)
2. proc it with your Ult (R)
3. Mark again (Q)
4. Spin to win (E)
Repeat
[And if needed (flashed away/used escape) dive after them with Ult again (R)]