Answer:
I'm not sure exactly what you mean. To literally "turn your wife into a whore," you would have to become a pimp, and that's illegal.
If you're talking about a sexual role-playing game, you're going to have to talk to her about it. Many couples engage in these sorts of games (doctor and nurse, king and slave girl, teacher and naughty student, etc.) to spice up their sex life, and as long as both of you are willing players, there's nothing wrong with it.
The easiest way to do this is to suggest a "light version" of the fantasy: you might buy her a cheap outfit and ask her to wear it in the bedroom, ask her to do a sexy strip-tease, or maybe just have sex with the lights on! If she's comfortable with that, you can explore more elaborate games.
Of course, you should invite her to share her fantasies in return. She might want to spank you, or ask you to dress up like a policeman.
The most important thing to remember is that you're doing this to enrich your marriage. Sex is supposed to be fun -- for both of you! But if wife doesn't want to play, don't press her. She may change her mind later!