Shaco needs at least 2 kills before he has his ultimate for beeing good feed. You can easily make them by combining your Q and E with your passive for more damage, and cast your W before start a fight. Ignite can give you the chance to run and kill the enemy without dying. You can also slow them with your E down your turret and its a secured kill.

Now you must have your ultimate, that means you have 2 Shacos, you must cast it right before you start the fight, that will secure your kill, remember that the clone must take the damange, you can secure this casting your Q behind him and leave the clone fighting alone, and when he dies you appear from your hiding place and finish the kill.
Remember that your W will give you bonus damange and a very useful Fear, it can make the difference between killing and beeing killed.
As always you cast once in the combat your E and leave it for when he runs.
Remember to use your Q for annoying him while he attacks the clone.
Health can grant you and your clone a very nice advantage.

Here are some tips that can help you:
*A good Shaco must go solo on a lane for securing the farming (Mid its the best option, for easily ganks)
*If you have no kills remember that you are a very good Kill Stealer (try to not get banned)
*Shaco is very weak against blinds and silences, try to avoid enemys like Teemo, Garen, Talon, etc before you are feed.
*Your Q can save your life, remember to use it wisely
*Oh yeah and NO, YOUR Q WILL NOT MAKE YOU INVISIBLE FROM TURRETS,DONT BE A SUICIDE!
*Wards are your enemies, try to avoid to get them planted on your lane
*If you are getting focussed, NEVER GO ALONE, just a silence and two enemies atacking you will result in your death

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IMPORTANT: be a Tank/AD hybrid doesn´t mean you aren`t a killer anymore, a combination of your Q and E from the stealth is deadly (around 1000/1500) damage in 2 secs

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I will improve the guide, adding photos and videos (MINE), this is like the beta phase
I hope you like it