Your in good company, don't worry. The great thing about these forums is that you can learn as you go.
Everything that is grounded has to get to the ring on the jack, so I think it's a good idea to clip one lead to that. The continuity that you are checking needs to be continuous to there.
Do all the things Simon has suggested with your foil. Test to make sure that everything that should be grounded is continuous all the way to the jack, by beep or very low (near 0) ohms.
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