What does 'black' magic mean to you..
Ditto. Makes it more difficult to make recommendations without knowing that for sure.
However, as a general rule, I would
strongly recommend foundation skills before getting into any specific type of spellcraft. At a bare
minimum, you need skill at meditation, or the ability to alter your state of consciousness at will to bring about focused concentration. I'd also strongly recommend energy work, some of the more basic aspects of journeywork (e.g., visualization), and an understanding of the principles of spellcraft or acausal thinking. Each of these is a study in of itself, and some of these I have good recommendations for, while others I don't.