So a bit confusing about it not being rene? well anyways a quick build to a lee sin which is very strong dps character which can really help in teamfights.your main goal is to get some lifesteal and i usually lane but you can also jungle him too. This guide is not going to get in dept like other people but its a simple effective way to use Lee Sin.

Focus on maxing the Q skill first
then the E skill 2nd and getting his ultimate whenever possible.
Last to max is safeguard W

so get q skill first to e to w then focus on q skill for dmg output.

Summoners spell is ghost for more movement speed and you can take flash but i like ghost alot better. Exaust is for those 1v1 moments or to save your buddy when you need to lower there dmg or slow them down.

armor pen is always nice on a dps and atk speed if necessary to get your 2 strikes before u use another skill or what not. armor is good too so you dont get killed as quick and flat health.

Mixed up masteries taking improved ghost and some magic/armor masteries since i dont need any mana regen masteries.

This is a typical dps build that puts out high dmg output but you can switch some items around and get banshees veil if they have lots of mages or get more armor items and switch it around.

Grab sword of yicullt of w.e lol if you are doing well.

usually early game harass with your q skill and dont use the 2nd atk unless u know u will not get stunned or trapped. eventually take the r skill for extra dmg output on harassing. next would be the safeguard or W. this is a very useful skill to help your teammates in need and give you some armor or lifesteal to gain hp while in lane. usually in teamfights i would wanna go with my Q and then activate 2nd effect to get in the fight and use E which allows u to do aoe dmg then do the activated effect for the slow/atk speed lowered which is very beneficial for your team. e can also be used to help team/ give u more dmg output. Your ultimate can also be used to knock enemies into each other for significant dmg and knock them outta there ultimate suck as katarinas death lotus.
so
Q > E > W > R > Q >E

Pros
Great harasser
Great 1v1
Great farmer
Stays in lane well
Good teamfight character
No mana used!
Unique energy
strong
More!

Cons
Kinda Squishy
Targeted first
6300 IP

When in a teamfight your E skill really helps alot along with your ultimate which will knock them away or in, breaking there ultimate such as death lotus. your safeguard is also a little help on teammates.