Shaco is one of the hardest champs on Lol. To master it u need to learn to use all the skills on the right moment and always know your survavility and your damage.

How to use Shaco´s Skills:

Q (DECEIVE):

This skill is the most important Shaco´s skill, is often used to gank or to scape. Be careful, you maybe want to save it to scape on early or teamfights instead of use it to go to their backs, it depends what you got in front of.
It has 10seconds cooldown and last 3,5seconds stealthed so you have just a little bit time to run/attack/dance. The most important thing is not to use it if it´snt neccesary.

W (JACK IN THE BOX):

This skill can make you kill or you fail, you probably know this ability and you have to realise that the box needs 2seconds to active and be able to fear (remember it´s an AoE fear).
A good strategy is gank with Q (deceive) and after the first crit hit, put the box in the way the opponent is going to run, so after 2seconds, he will get feared.

E (TWO-SHIV POISON):

A nice skill with two parts :D The passive one makes a perma-slow 20% to 30% to the enemy you autoattack and last 2seconds after you last hit. In order to maximize this skill, a good Shaco player will slow all he can and just use the other part of the skill when the enemy is low hp or too far to be hit. The second part consist in you throw the dagger making 50 to 200damage plus all your ap and 1/2 your ad.

R (HALLUCINATE):

And finally, this skill is the funniest skill after Blitzcrank´s Q (Rocket Grab). You summon a copy of you that does 75% of your damage (autoattacking) and receives 150%damage you would receive. The way you use it could mark the difference. Some noob Shacos press R and continue fighting but you should know some things and strategys you can do.
1º The copy can be moved with Alt+right click.
2º The copy lasts 15seconds, enough to do a lot of things.
3º When the copy dies (killed or after 15seconds) it does an aoe magic damage (300/450/600 i think).
4º There are two ways to use the copy: the offensive way, you summon the copy to do more damage. And finally the deffensive way, you summon it and make it run away while you stay and apparently you running and the copy stopped. This can make you survive when you have Q (Deceive) on Cooldown.

To master Shaco you have to play, play, play, pray, play, play and you will became the Demon Jester :D

Hard champ but one of the funniest and worst nightmare for your enemies.

Always start with Cloth armor and 5 Health Potions

With Smite
Jungling with smite is pretty easy and simple, if you choose ghost instead of exhaust you can put 5boxes in red and run with ghost to the blue buff and do it both at the same time.
If you take exhaust, my start is:
3boxes in wolves
3boxes-smite in blue
Then go wraiths, red (2boxes+autoattack and no need smite) and golems.
Remember your blue will respawn at minute 7 more or less depending when you killed it.

With no Smite (exhaust ignite)
At the moment when jungle is so squizzy i prefer to use this spells in order to hard gank and be able to go 1vs1 against the other junglers.
My start is the most known:
5-6boxes on blue
Smite to big wolf
And then normal jungle.