Find an empty parking lot on a snowy/icey night and just go driving. That is the only way you can learn. In my down you have to know how to drive in the snow since you don't see any tarmac untill april.
To get out of any situation, just stay calm, look where you are going, do not press on the brakes, and drive. When most people slide, the first thing they do is slam the breaks. That is the last thing you want to do, the reason being you already lost traction, thus the brakeing will have no effect at all. Just stay calm, look to where you want the vehicle to go, and give her a fair amount of gas. This will bring you into a drift situation.
To counter the slide/drift just steer the car into the slide and feather the gas ( reving the engine from 2000 to 4000 RPM). This will keep you in the drift. To come out of the drift slowly let off the gas, and prepare for the kickback/faint. The kickback/faint is when your vehicle will gain full traction again. This will throw the car's body from one side to another. This is the most dangerous part. If you have a vehicle with a high centre of gravity ( jeep, truck) this is where you would roll it.
After alot of pratice, and alot of time in bad weather your gonna learn how to have fun with RWD vehicles in the snow. You will know how to make the drifts, how to control them, the right inputs into the steering, and how to use the faint/kickback to make more drifts.