The Stage Know-How
Ok the start is normal until you get bottle, then you spam your Q and occasionally abuse them with your W. At 11 mins go around to gank people, they need you for kill's and is a great way to keep your team happy.
Now it's the mid-game, now you must take all tier one towers and oppose a threat to the other team, in this stage you should have around 7-10 kills if ganking properly. You should have drums and aim to be in almost every team fight powering your team to victory.
We have come to the late-game, some people think you are useless now but you are not, the trick to this part is timing, you shard and ball into the enemy and then you hit them once followed by your ult this will kill them or make them highly damaged, do this all the time to ensure victory!