STEP1: Start red always, go to the plant on the enemy wolves and jump. ''Oh what is this? a jungler thats half hp? thanks for the kill!!'' or '' no one?''.
STEP2: If you jump and see the enemy jungler instantly engage on him with E, keep aa until he flashes, if he flashes use your Q to catch up.
If you see no one its because he started red. In this case, do the wolves and put a trinket on the jungle entrance ( to wolves ) and stay inside the wolves spot so he does not see you.
STEP3: ?? Profit i think?
IMPORTANT-> IF HE STARTS RED AND YOU KILL HIM, DO HIS BLUE AND BACK.
ALSO VERY IMPORTANT TO WARN YOUR MID LANER TO FOLLOW THE ENEMY MID LANER IF HE DECIDES TO HUNT YOU DOWN
if you are insecure just back after first blood.

This will get you a HUGE LEAD over the enemy jungler putting you SEVERAL LEVELS AHEAD.

What should i do ???
-Dont gank until level 6 (only gank if you see a good opportunity).
-Dont fight too much if you dont have the red smite.
-Abuse the 1v1 potencial to harass your enemy jungler when you get your level 6/red smite
-DONT RUSH DRAKES, you will only put yourself behind. Only go for infernal drake or occasionally mountain if you have nothing better to do.
-Help lanes push after a successful gank and try to take down turrets.
-If you have red smite, look forward to do herald since it usually means that you will be able to push atleast one tower and damage half hp to another one.

Teamfighting
-DON'T ENGAGE EVER.
-BE A *****
-LET YOUR TEAMMATES DIE (ok don't, but make the enemy waste their cc on your team so you can cleanup after that, what i mean is: only go in if you are able to not die instantly from CC)
-Split push A LOT, since you have 1v3 potencial you can splitpush. And if fed enough you can even kill them all, one by one.