At first, start with Dagger and 1 HP Potion. Do a early gank for either mid or bot. Get level 3 for all your skills. Roam a little bit to mid. Get a few kills (2-3) and by then get your boots, after that you want to get another Dagger for your Black Cleaver and save up for the B.F. sword, by that time either start pushing or get dragon with a tank. Alistar is a good tank with Xin Zhao. By the time you push, the team will gank you so make sure you have your Flash ready or Your ultimate if you want to counter the gank. After a short time you will have a Phantom Dancer and your Black Cleaver. Start Ganking Top and mid. Keep bot a little pushed. Push top and mid then you want to continue with bot so you wont get too much ganked. By this time you will have atleast 5 kills or so. After you get Infinity Edge start getting both blue and red buff. Kill Dragon every time it is back. At level 11 you will have your ultimate level 2 which is when you start pushing all mid. Mid will be pushed a lot which will help your team on games with tons of tanks. When the whole team is level 17 get Baron. This will help a lot with your team and your attack. As you get Bloodthirster you will have 3 choices. If there is a tank on the other team like Rammus who has Thornmail to counter your attacks, get Last Whisper to get Armor Penetration To deal with it. If there are a lot of AP champions on the other team you want to get Trinity Force so you can slow them that way they won't run away. If there is more AD than the AP than i suggest you get Sword of Occult because it will increase your damage by per kill so you will get 100 Attack if full which would get you 483 Attack Damage at level 18. It will kill fast and since you have Bloodthirster you will easily 2v1. By this time get Baron for the second time and start pushing all sides. Once all places have both 2 towers gone, start pushing mid all together to force them to go mid. While you are fighting your minions at Top and Bot will push by themselves. If they separate this is a good thing which give you the advantage to push mid more. Focus the tower and if you have a tank start killing by Tower Diving. This will split their team and they will be dead leaving 1-2 people alive. Then push Top tower/inhibitor and Bot tower/inhibitor then this will end the game making you win.