Not Updated For Current Season
ask your team to help you getting the golem buff. After that go mid and harras as much as you can, especially using your Q + W.
Sometimes you will have to jump first, shot a Q and go back with your W again.
To get an early kill use your flash to get close, Q + W.
You should be able to kill your enemy before level 6. If you do that you will be able to kill him as son s you reach the level 6. Its important not to die, specially with this char becuse it mainly shines on mid game. For this reason if your teammates ask you for help go and help them. each kill gives you some staks for your Mejai's :P
It's important to be able to choose the items you will buy, you won't always use the same items. If your enemy team is full of casters or stuners get the mercury's Treads.
Talking about spells, if you dont like flash or ghost you can get ignite or clairvoyance as well, even teleport is good for moving fast to other lines.
Its important to know that you can jump walls using your W and go back reusing it. It can be helpfull for scouting, steal any buff such as D or golem, or just for ganking.
Your ultimate is really powerfull, specially if you know how to use it. With it you can repeat a Q to silence your enemy, scape using it after a W or shackle an enemy twice repeating your E. You have to keep in mind that it will copy any spell you casted before, so dont always copy a Q just to deal some damage :P.
That's it. This is my first guide, enjoy playing ^^