To play Shen, you're going to need to be aware and agressive, well that's how I play him. You need to keep up with your CS (creep score), push when there's an extra person in your lane, taunt when they're at your tower and you MUST be aware when you play Shen. Common sense is also needed, you can't just go and towerdive in when none of your team is backing you up, that will end up with a dead Shen and a free kill to the opponents.

Select your masteries at 9/21/0. The extra magic penetration will help you kill champions and also help you last hit better, also get the point in exhaust. Tenacity will help you stay alive, and the 3 points in Ardor will give you some extra damage.

You're going to need to max out your Vorpal Strike. This way you can do a lot of damage and it will help with your last hits. Max out your taunt second and get the occasional Feint for sustainability. A longer taunt means more time for your team to focus them down and damage. Feint is still good, but not needed as much when you use this build because of your high armour and health.

When you play Shen, you're going to need to last hit in order to keep up your gold. Using your Q (vorpal blade) to last hit is what is recommended, but if the target is on too higher health you use your Q and then you hit with a Ki Strike (passive). Shen can dish out a lot of damage, but you need to use that to your advantage with the right timing.

When you first start the game, don't be scared to get agressive and smack the opposing team around a little. If you get a Doran's Shield first this will regenerate your health and also give you the bonuses of armour and health. Rush a heart of gold for the extra gold, then build a Ninja Tabi or Merc Treads depending on the situation, Aegis of Legion next. Next you're going to build a Randuins Omen, Force of Nature and a Sunfire Cape. If the game lasts any longer, sell the Doran's shield and get a Frozen Mallet.

In order to be a good Shen you must be aware. You have to initiate teamfights and also keep a tab on your team's health. Engaging with a taunt is a good way start as you can taunt up to 3 people at once, making it easier on your team.

If you play a ranked game, remember to get wards and put them in the river. Near dragon and Baron are good places to place them. Awareness is a must when you play all types of games.

If you're in range of a turret and it's focusing on you, before it hits you press W (feint) and block some of the damage. Hitting targets while the Vorpal Blade effect is on them will cause you and your team to get health back. Someone taunted by Rammus? Hit him with a Q and the person being taunted will get health back. Low health? Slap them with a Q and then whack them to get your health back up. Your Ki Strike can do a tonne of damage, but you need to use it at the right moment.