Who do you contact? Your best bet would be a psychiatrist or even better would be a psychic or a medium. They would be more in tune with paranormal things.

White magic is good magic. Literally. White magic is what Wiccas are, they are in touch with nature and the spells are for good. Black magic, like voodoo, is bad.. very bad. Black magic usually uses curses or bad spells, using magic to improve your situation (material way) is not a good idea or putting a curse on someone will always backfire. Voodoo is extremely bad, creating zombies, curses and so forth. You can identify them now I think!! Black magic is bad, because it is usually at the expense of someone else, you wish someone bad luck. You know the saying what goes around comes around? Well, think of it like that. Using magic to better your situation can attract bad spirits and energy. By the way, stay away from Ouija boards too!

Hope this helps, let me know if you need any more info.

Tash