You want to start red and finish your red as fast as possible. After this just start ganking like crazy and continue to farm jungle. Try and get the kills when ganking lanes as it will let you build items faster.

If you get fed just start 2v1 people, and look for as many kills as you can. In teamfights just charge to ADC with bear and burst him with tiger into pheonix then tiamat.

Always focus the ADC, then switch to lower health targets, you are not to tanky so remember this when it comes to teamfights and your limitations.