Lost for words here, just follow it, it's simple I guess...

Think rest of the summoners aren't as good on Lee for without flash your Insec possibility goes down. On Top tho you can take Ignite instead of Teleport if you think you can be aggressive early and capitalise on that.

PROS
-Great early game
-If you can control your early power, snowball possibilities are huge, especialy if you're jungling
-Best skin pallet in game :D
-Very fun to play champ
-Huge mobility
-Strong burst
-Sweet, sweet plays

CONS
-Very, very hard to master for you can f**k up in so many ways it's beyond believing
-Really have to practice combos and best ways to gank
-High likeliness that if falls behind early on might be ueseless
-Hard-ish to farm with

Try to gank early as much as possible.

Your 2nd part of q( Resonating Strike) is an execute so use it when enemy or monster has low hp( if possible).

U can combine with your 2nd part of w( Iron Will) for more HP recovery.

Try to recover HP by hitting crab by using Iron Will so you have more HP before ganking.

If your has enough damage you can kill the creep with it and if your aim is right, hit an enemy behind it with your Sonic Wave

Not very skilled with Lee Sin, so I play it like this:
Do or Die, I will go Krugs/Gromp depending on which side I am on, blue for Krugs, red for Gromp. Take level 2 and level up e, so I can invade with more damage but you can take w if enemy has important dodgeable abilities. If you don't manage to get the kill on enemy jungler try to bother him by harassing him in terms of poke or just dancing around but beware of laners that can help him. Rest of the early jungling really depends on what you did in that invade. If you killed him and took his buff, you can go to his other buff or take closest alive camp to the buff you took, and if you didn't manage to kill him I'd suggest going back into your jungler if you have enough hp. Later you can try by invading him on his 2nd buff or ganking lane that is gankable or which is further from him. Rest of the early game is usual, farm jungle, gank, maybe camp if possible, help your team.