Jungling may require experience with the game, but quite a few champions are viable to jungling.
DPS and tanky is good for jungling, but some mages/casters can jungle quite well.
Champions good for jungling:
Basic(Easy for newer junglers):
Warwick
Nunu
SEjuani
Master Yi
Amumu
Xin Zhao
Moderatly Difficult Junglers:
Shyvana
Irelia
Dr.Mundo
Shaco
Shen
Hecarim
Udyr
Olaf
Fiddlesticks
Skarner
Diana
Volibear
Nocturne
Some junglers better for experienced players:
Elise
Diana
Kha`Zix
Maokai
Akali
Swain(VERY tricky jungler)
Lee Sin
Starting build for most DPS and Tanky champions:
Hunter`s Machete+Health Potions; finish into Wriggle`s Lantern, the rest of the build differs by champion.
Any others new to jungling with a question I missed? Want to ask me about Which champion(Is he/she/it good for jungling)? Ask me, MeowingBadger, below in the replies. See you in the fields of justice!
Also, Feel free to ask me what monsters to start with, summoner speels/builds for different champions, and monster stats!

Personally, I like Nunu, hecarim, and Irelia. Sometimes skarner.
Always remember to take smite when jungling(Duh)!

I would suggest cleaning up this "guide". It's messy and hard to look at.

Gangplank can jungle. And so can Alistar, and he might be slow but he's a good ganker. But I jungle with both of them, as well as Rengar and Fiddlesticks.

It`s not a full guide, just a little bit of info. Ali is a good jungler, but I can`t get eeryone, just like GP.