Use your spear shot first followed by aegis of zeonia then heartseeker strike to get the most damage dealt in early game. In later game you mostly want to get in the most basic attacks possible. when your passive "Block" Is ready can you use your ultimate over a turret, then u target someone with aegis of zeonia before you land then use spear shot and heartseeker strike to kill the person and reload your passive and get away with minimum damage taken.

Take armor pen runes to deal a lot of damage to tanks and people with a lot of armor. attack speed to get the most damage dealt fast. and critical chance to kill quick and instant.

He need early kills to get good, when you attack you almost have to finish. he is made for getting into the fights and deal a lot of damage but he is not good to flee with. thats why i take flash as one of my summoner spells. the reason why i take clarity is that if you you are out of mana and some one is trying to flee you use your aegis of zeonia to get him stunned and kill him. its a good summoner spell because of you can get a lot of kills you would not get with oute.