...especially for someone who is still relatively new to jungling. Also welcome in this thread are general tips for novice junglers.
(Some context here; I'm trying to learn a new role to maybe help myself climb a little in ranked)
I'm a novice jung myself (only lv. 14). Warwick is a good pick. He is only able to target a single champ, but it's normally gets you a kill with his ult. Also, he has great sustain.
Well everything about jungling is going to change in S5 so be careful about getting to use to the current jungle.
Also Nunu and Warwick. Since you are new to jungle I would NOT recommend Lee Sin because he is really hard to play. No matter what people say.
If you're very novice to jungling, I'd suggest either Warwick, Amumu, Fiddlesticks, Aatrox or Master Yi. All four of those champions are both relatively easy to learn and play.
At a more advanced level, you'll be able to start playing stronger junglers such as Kha'Zix, Shaco, Lee-Sin or Rammus. Kha'Zix, Lee-Sin and Shaco are all good picks to anti-jungle, and Shaco's useful as he won't require a leash on his first buff.
I don't personally main jungle, however, you can find many detailed guides throughout YouTube if you're specific in what you're searching. Being good in a lane won't happen overnight, or after watching only one or two guides/game-plays. Keep watching streams/videos and you'll get more familiar with the jungle in time.
Best of luck! Also note that different champions benefit the team in different ways.
To put things in perspective, Amumu's more of a TEAM jungle, whereas Kha'Zix is more famously known to carry himself. If you've got any more questions, I'll answer them to the best of my abilities!
And very lastly, junglers I don't recommend (for novice players)
http://www.youtube.com/user/TrickJungleGuides
Trick can help you learn the jungle VERY efficiently, pay attention to the various tips and tricks he mentions in his guides!
Kha zix is really strong because people will always be isolated that low in levels
Since your new to jungling I would recommend evelyn, xin zhao and jarvan as 3 good junglers that are fairly easy to play.
Evelyn would be my top recommendation because shes still good after the nerfs and being invisible is really helpful when learning how to jungle.
