If I'm not overstepping, I'd like to throw in what works for me (in solo matches)
My Summoner Level is 14.
Masteries: 14 points in Offense
The champion I use for jungling is Warwick.
The route I do requires no help from teammates whatsoever, but you won't be ganking (effectively anyway) until lvl 4 and beyond.
Purchase cloth armor and 5hps, and start with your Q
Kill little golem first, use Q as needed. Use 1 potion while killing golem camp
Go to wraith camp, smite big wraith, activate 1 potion, and auto-attack the lil ones, finish off the big one, use Q as necessary
Go to wolves camp, Q as needed, 1 potion, kill lil ones first, etc
Smite should be off cd by now
Go to Blue camp, use 1 potion BEFORE attacking, and use your other one during the battle, smite big golem, then auto-attack, W, and Q until it dies, then finish off the little guys.
For skills, Q for the first skill, and upgrade it as often as possible AFTER getting at least one W and one E. HOWEVER, his ult always takes priority, if you can put a point towards his ult, do so whenever possible
After the first run through, you can either return, heal, then take red, or take red immediately if you have a decent amount of health. Once you hit 4, keep your eyes out for potential ganking opportunities, and continue jungling.
Warwick can solo the dragon Once he get's Wriggle's Lantern
He can solo the Baron at around level 14 or 15 (depends HEAVILY on your amount of farm, build, masteries, etc, and I NEVER recommend anyone try to solo Baron unless they are unbelievably familiar with Warwick). He can solo the Baron at level 18 as if he was killing an under-farmed enemy (slight exaggeration, but not far from the truth)
With the correct item build, he can 1v1 almost any champ, even when WW is at a lower level, and he can win. He can 2v1 certain enemy pairs if he is equal to them in level and has blue and red buffs.
If you can get a few early ganks, a lot of players will start to keep their distance, essentially meaning Warwick's presence in-lane is, by itself, enough to send them back to their tower, or at least, far enough away from you to where you can farm minions freely