I won't be explaining the whole jungling process since it's really hard and just requires experience in the game and just changes in every game, but the basic idea is to start in the same buff as your enemy (ask teammates to ward or check, if not just pay attention to who gets late to the lane, that usually means he leashed that buff). Once you know which buff he started just prepare yours with your pasive DON'T SMITE IT! Then rush to the enemies oposite buff (you might prepare another camp with your pasive if the enemy team has a rather slow jungler) then go to the buff that your enemy didn't start off with, prepare it and smite it, now you can either go gank a lane with your lv 2 and the laner lv 1 (this is a high risk high reward strategy, if you get the kill or assist its worth it, if you get a summoner spell off its ok, you can come back and punish him later, just know that if you show up with the enemies buff, he most probably will invade yours to get it so ask for help to your teammates or simply give it up, your call). or either get back to your jungle and start clearing it, save your smite and ward for the 2nd buff so as for it not to be stolen. From now on the clearing and ganking is on your own, I just can advise you to save smite for invades on the oposite buff, punish him for showing in the lanes.