You know the drill!Gank often, prioritize buffs over other camps, buy wards, cover lanes, keep timers, controll objectives, buy more wards, help win 3 lanes, get raged for not ganking(|0|)
Q- once check the surrounding before using Q twice.
W- at wards over walls to stay alive.
E- from the front of them, blocking their path and making it easier to kick them into your team.
R- from the front of them to kick them into your team.
Your main roles as a jungler are stated above, sorry for being brief. Have to get back to work.
I've been playing Lee since May last year,and I must say he's one of the most rewarding champs ,if played right. Hope this guide helps!