For the Jungling route, Start at the enemy Red then one of the jungler's goes to there mini golems and the other to wraiths . After you have cleared those you can either level two gank, or you can head across the river back to your side, and then clear your Blue. After that you should be level three. If not go to your wolves and you should be level three. Now at this point each of the jungles can do one of three things, they can gank a lane, continue there jungling, or go back to base and by items. Most junglers in double jungling can do the entire jungle with only about 2-3 bars of health depending on there jungle partner. So if you decide to continue jungling you head to your wraiths, then your Red, then your mini golems. After doing this whoever got blue buff first should be almost out of the buff, or out completly, so you should head over and take the enemy Blue. After this you can pretty much just roam the map and help were your needed. IF your playing against a team with a jungler, read the "Against A Team With A Jungler" section.

For doing double jungling, you should be in a full party, unless you want to annoy the randoms that you are partnered with. Your team mates should consist of 2 tanky champs to take the top and bottom lanes, and a good mid champ. It would be a good idea to be a coordinated team that is competent that they can win.

When playing against a team with a jungler, you should figure out where that jungler starts, for example, most lee sin players would start at wolves, then go to wraiths, making it a bit dangerous for the player that clears wraiths after Red. So to counter that, the double junglers would most likly want to just clear Red, then head to there own blue. But, if there jungler starts at Mini Golems, like Warwick, you would want to start at the enemy Blue, then do there wolves and head to your Red side.

A key thing to know as a double jungle team, is that you can most likly kill the single jungler on the other team unless they have some sort of escape mechanism, so dont be afraid to start somewere on your side of the jungle making it so when you head into there jungle you will be in the same area that the enemy jungle would be just about heading to, and set up a kill on him.

I am very tight in time so i will be adding onto this guide slowly

Even though my jungle partner is a baddie, I have to give him a shout out cause without him I wouldnt be double jungling in the first place.

This is the Link to his Shaco Build,
http://www.mobafire.com/league-of-legends/build/your-all-out-shaco-guide-ap-ad-jungle-lane-110955