Someone else's interpretation: At #1, the Magician is the male power of creation, creation by willpower and desire. In that ancient sense, it is the ability to make things just-so by speaking them aloud ("And God said 'Let there be Light!' and there was Light"). Reflecting this is the fact that the Magician is represented by Mercury. He represents the gift of tongues, a smooth talker, a salesman. Also clever with the sleight of hand (Mercury *was* the god of thieves!) and a medicine man - either a real doctor or someone trying to sell you snake oil. The 4 suits laid out before him remind us of the 4 aces, which in the Tarot symbolize the raw, undeveloped, undirected power of each suit. When the Magician appears, he reveals these to you. The reader might well interpret this card as telling the querent that they will be given a vision, an idea, a magical, mental image of whatever it is they most want: the solution to a problem, an ambitious career, a love life, a job
My interpretation: The Magician is the card of giving an idea a form through words. It is the card of taking the new beginning shown by the Fool, and giving it a form and the beginnings of a purpose.