Someone who perform magic tricks for entertainment, is an Illusionist or Magician.
Someone who practices ritualistic magic may be a Shaman or generically called a wizard (male) or a witch (female)
In Harry Potter a Squib is a person with magical parents but they themselves cannot perform magic. they are the opposite to muggle-borns who are born into non-magical families and they can do magic Squibs are in non magical families but cannot perform magic
check out http://www.masteryourmagic.com/learn-magic/?a=a83
One can learn how to perform funny magic from websites like Good Tricks, wikiHow, Birthday-Party-Magician, Grand Parents, Silly Magic, Xplore Magic and Blifaloo.
The only thing, is to believe.
A person can find a Magic Marker and have it.
Yes, in fact, some of his tricks uses black magic, and some do not. Believe or not folks. Cyril Takayama uses black magic... Usually, the people who practice the spiritual craft of Magic (Black or White, Wiccan or Satanic), do not "Perform Magic" to amuse other people. But that does not mean those who perform magic do not know the real magic.
There are several websites for magic lovers to log on to. They may learn to perform their own tricks, or can just watch other magicians perform. Some sites are Ellusionist, and Learn Magic Tricks.
Celesta
the Big Bang
Only after 17 years of age... when you can perform magic outside of Hogwarts.
Only if you can convince this person that your magic works.
Criss angel is the most famous person who does magic