Hey guys, this is my Bruce Lee's training method for Lee Sin. Prepare yourselves for becoming true experts in the art of jungling and in Lee sin's mechanics! You just have to remember: Force is meaningless without skill! So practice a lot, specially the WardJump (I'll explain later). Get Sonic Wave and Safeguard smartcast, you can also get Dragon's Rage smartcast, but it's not that important.
Let's begin!!

First set, an AD set. Lee's early's too stronk, start massive AD to get burst and snowball.Second set, a classic AD jungle set. Build this rune page if you wanna help lanes more than getting kills and snowballing. The only difference is Greater Quintessence of Movement SpeedSelect which of them you must use in each occasion basing on your team. For example, if you have a strong early adc you can help him to get some kills at the beginning and then start focusing top and mid. I prefer using the first one, snowball's OP :D.

Offensive early, oneshot carries. Defensive late, get in and throw the adc away. Simple way to carry games. If you start getting kills (ex: you get a triple min 8:00) you can buy Bloodthirster instead of Ravenous Hydra for more AD and life steal.
If during mid game you're still getting fed, you can also buy Black Cleaver to continue snowballing and building tanky at the same time, until you're useless. Then you can sell something and buy a tank item, such as Warmog's Armor or Randuin's Omen.

Q for damage and effective ganks.
E for magic damage and slow.

EXTREMELY IMPORTANT
Always autoattack to times between using abilities. Example: Q-auto-auto-Q-auto-auto-E-auto-auto-E...
This is just because of Lee's passive, Flurry, which allows him to keep having energy even after casting and deal more damage per second thanks to the attack speed buff.

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COUNTER JUNGLING
Counter jungling is perfect for Lee, so start humiliating the other jungler by getting his buffs. You can start invading blue or red, but i prefer getting the other buff. If, for example, the other team is gonna get the blue (ex: Elise, fiddle, etc), then go to their red and get it for your own. Get the timing and be ready to have it next time.

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GENERAL JUNGLING
If you're not gonna counter-jungle, it's perfect if you can start at red. Obviously, you can also get the blue if you think it's better for your team. May be they can't pull your red for any reason, so be ready to change your target at any moment. It's better if you get some kills ar the beginning, and afterwards let the laners get the kills to feed them.

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GANKING
Gank lvl 3 -> enter with wardjump on trinket, Q,Q,E,E // enter with Q,Q then E,E

Ganks lvl>6 -> Third combo, kick gank combo, we'll see it afterwards.
Try to enter the lanes when they aren't pushed. However, you can't gank while there are too many enemy minions, remember that.

WARDJUMP
Place a ward and use the W on it to dash to the ward location.
Smartcast is really useful to do this faster.
KICK GANK COMBO
Enter the lane with a Q on the enemy, use E to slow him and Wardnjump to his back. Then, use the ult to throw him near your ally. Free kill!
Q-R-Q
Q -> kick your enemy -> Q. You can use it to throw an enemy near an ally. This combo can have an amazing damage, so use it carefully if you want your ally to get the kill.

So, that's it! Hope you've enjoyed this pretty short guide and you get some more experience about the Lee Sin plays. This is my first guide, so remember to comment and be critical, I need to learn guys! :D