The first thing is being a vampire is impossible. You can't transform to anything physically. It takes nine months to make a baby imagine how much energy and time it'd take to transform into an adult sized, large fanged creature.
There are psychic vampires that enjoy stealing energies and such, you should research psychic vampires.
As for "everything about magic" gosh I hate when people ask such a broad question. Magic is a universal energy that interacts with our intentions and emotions to help ourselves accomplish tasks. You can't create fire or manipulate elements with the mind alone, you can't be a vampire or grow D cup tits, you can't be a werewolf etc etc.
Black magic is simply magic with negative intentions. Some don't consider it or any magic to have a color at all. Debated, some see love spells as black. Others can be curses, spiritual harming, bad luck, etc.
For a curse just think about someone and imagine negative energy entering them. This is a curse in a basic form. Though there are plenty of spells here, the beats ones work because they are personal and made by you.
Don't mail me to teach any further, I can answer [specific] questions about beliefs, subjects, etc but don't ask something as broad as "everything about magic" I also won't make spells for you.