How do I junlgle?

This is my worst role, I haven't touched this and when I do I have little idea what to do. I have gotten this role either at random (even though I had selected mid/ bot/ support) and when I did I always lost or got carried. My pool of champions that can jungle are: {{champion:19}} {{champion:33}} {{champion:102}} {{champion:20}} Oh great I spelled the title wrong I am not familiar with any of them either in lane or role, so tips for someone stepping into this role for the first time would be appreciated.
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