That would be SP. Your body is completly paralyzed and the black thing you saw was part of an extreme HI. This happens to many people who don't know anything about Sleep Paralysis and it freaks them out.
And as a beginner I suggest going for a MILD or DILD first as these are the easiest to accomplish. You can find a tutorial
Here for DILD and
Here for MILD. Eventually you can move on to WILD or you may wish to try WILD at any time you like, there is nothing wrong with trying techniques to see what works for you.
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