In early game when farming I like to position myself to kill the minions and hit the enemy at the same time with my q. Once I hit level three I like try an all in depending on the enemy if I know their champ well (Wouldn't recommend against Cassiopeia). Also during laning phase look for the opportunity to roam bot/top or invade the enemy jg if you know the path they take. Because of your invisibility it makes it hard for the mid laner to accurately ping that you are roaming. Something else I personally like to do in laning phase is try and gank my own lane by going invis walking behind them and attacking but make sure you know where their jungle is. When it comes to late game try to pick off the squishes or deny the jungler camps and stuff.