Start with dorans shield, makes you almost unkilable in the begining, just spam your q, hit and go back. you will NOT DIE and maybe have 1 or 2 kills before going to buy if you do this.

Second item, boots. YOU WILL NEED TENACITY and speed. Then Mad razors, crazy chance on hit with creeps, you would two shot them if it procs, one shot later on. Upgrade to latern, USE THE WARD TO JUMP BACK TO IT, always, just place it, if youre gtting focused just jump back, no matter what. if you KNOW that you can kill then stay.

Third item, Giant´s belt. when you get it youll be tanky. it gonna be too hard to kill you. The latern damage will be enough for now. Upgrade to Phage, more damage and slow. Upgrade to froen mallet. Nobody will scape from you, plus your slow. they gonna run when they see you.

Fourth item, Atmas Impaler. The game should be over by now. if you get to buy this you might be able to end the build. Get the cloack of agility first, then the armor.

Fifth item, Black cleaver. Get the BF first. A plus to your ArP an a bunch of AD.

Sixth item, Tri Force. If the game is that long, sell your dorans shield and buy this. Its a good item for lee sin.

By this time you can solo anyone, buy elixir if you got xtra gold. Enjoy.

Sonic wave first, it gonna be your main skill. Safeguard second, to scape. Then tempest to slow them. By now just lvl sonic wave first, you will need to LEARN to hit with it, dont suicide using resonating strike if you wont survive, play smart.

Ghost. use it to chase or scape.
Flash. Same.