Lee Sin is a very fun champ to play; with a unique ability system, he's the only one with 7 abilities. The two abilities per ability combined with his passive (Flurry: Every time Lee Sin uses an ability, his attack speed is increased by 50% for two attacks) and safeguard's second ability Iron will makes Lee Sin an excellent jungler, allowing him to go a sustained route from the start, then pretty much wherever you want.

In my opinion, laning Lee Sin isn't nearly as strong as his jungle.

-Start with a vamp scepter
-Start at wolves
-Move to wraiths, smite the blue one and kill the rest
-Double golems, then back for boots and potions
-From here you should be ganking, grabbing jungles on the way

IF TOP NEEDS A GANK:
-Grab Red buff first
-Grab wraiths, head up river to gank
-After ganking, grab blue if you can

IF BOTTOM NEEDS A GANK:
-Grab Red
-Gank
-Have them help you get dragon, if you all can

IF MID NEEDS A GANK:
-Red
-Wraiths
-If you can, try and get someone from your double lane to help
-Gank (duh)

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Also: all you jungler should be asking: WHEN CAN HE GET DRAGON?
Lee Sin can easily get dragon around level 6, or whenever you get your Wriggles, and Berserker's Greaves

Lee Sin should make an entrance to a team fight right after it starts; Sonic wave into it from a brush, and use Tempest and Cripple to slow them all.

Also; use Dragon's Rage to knock either their main damage dealer, or even their tank through their team, knocking them up and putting their damage dealer or taker out for a bit

Sonic Wave and Tempest reveal units. This is amazingly convenient is the opposing team has a Twitch, Evelynn, or even both D:. Just smash tempest, and you just might find a rat laying there, terrified of the blind menace.

-Wriggles: Lee Sin is a jungler; most jungler's get wriggles
-Berserker's Greaves: Lee Sin's passive gives him attack speed, so do these boots! (Merc treads are a possibility if you REALLY need them, but if possible, I do recommended 'zerkers)
-Brutalizer: Being an energy champ, cooldowns are really the only thing stopping him, especially with Flurry's energy regain. Also, I don't really use the upgraded version
-Triforce:
-Phage: Lee Sin attacks fast, so the chance to slow shows often, and the health is nice
-Zeal: MOAR ATTACK SPEED PLZ
-Sheen: This is nice just for the double damage attack after all the abilities Lee Sin uses
-Guardian Angel: Really the only defensive item he needs, and with proper teamwork, if you're trapped after "death", you can safeguard to an ally over a wall
-Last Whisper: Armor Pen on an AD champ? Need I say more?

(Optional to sell wriggles and get these)
-Hextech Gunblade: Lifesteal, and Spellvamp are good on Lee Sin. Its like always having Iron Will on! The only thing I dont like about getting a gunblade, is it sacrifices the free ward from Wriggles
-Madred's Bloodrazor: I only recommend this if their team has a lot of health

-No Flurry on safeguard sometimes
-"Double Tempest" This often happens accidentally, but alot of people use the bug to do way more damage than he should.

Nothing else that I've seen, but since he's a relatively new champ, I'm sure Riot will fix it, because I know Morello knows about the double tempest

Lee Sin may not be the best AD champ, but in the right hands, can be a rape train of destruction. Even if you don't go legendary, everyone I know says he's the most fun champ to play, and I completely agree. His ult is great for teamfights, and skirmishes. His jungle is amazing, and his ganks are pretty awesome too. I hope you have alot of fun playing him, and I hope you found this guide useful on your way to mastering the "Blind" Monk