I play Lee Sin either mid, solo, or lane. He can also be a jungler. I jungle Lee Sin after buying Madred's Razors or Wriggle's Lantern. Approximately by level 2,3 or 4. I play Lee Sin as an aggressive champion by harassing or completing the combos.

For runes. I take Armor Penetration Marks, Attack Damage Seals, Attack Damage Glyphs and Attack Damage Quintessences.

I go for 25/5/0. More like being brutal and aggressive.

My starting items are Long Sword and Health Potion. Followed by Berserker Greaves and Wriggle's Lantern. I could already go jungle or stay on my lane. Then I buy B. F. Sword to make my damage higher on early games. From this point, I'm starting to build Warmog's Armor. To be followed by Atma's Impaler. Then The Bloodthirster. After BT. I'm now building tank item such as Thornmail. Then I replace my Wriggle's Lantern with Force of Nature. Trinity Force could be another option, instead of Force of Nature or Thornmail.

Note:
(If you are going to replace Thornmail or Force of Nature with Trinity Force)
If your opponents are more on Attack Damage, replace Force of Nature.
If your opponents are more on Ability Power, replace Thornmail.

Exhaust
Flash

For ranked games. All I do is to take advantage of my damage. Trying to take control of the entire game and to make it a fast game. Ganks must be successful. It is the easiest way to push and to level up faster.

All you need to do is to completely land your Sonic Wave then Resonating Strike followed by your Tempest. Or after using Tempest use Exhaust on the opponent. To make sure your ally can cope up and deal damage to the opponent/s.

I play Lee Sin as a Hitter and a Tanker. I also play him as a setter especially for team fights or clash, being able to Tempest opponents that are within the range.