'Boku no, namae wa *insert name* desu'
Hello, My name is *name*.
Don't use Boku, unless you want to be laughed at. It's the wrong congergtion.
Boku is a very VERY childish way to say hello. It's like kindergarden childish. It can also be very very boy-ish too, depending on context. Either way it's not professional.
You will want to use Watashi. You may hear the girls reply "Atashi wa" Atashi is feminine. Avoid using that too, unless you want to sound homosexual, or at the very least very affeminenate.
"Konichiwa Mina-san, Watashi wa (your name) desu. Genki Deska?"
(Kon-EEchee-Wa Mee-na san. Wah-tah-She wa Des. Gain-Key Des-kah?)
Translates litterly to: Hello everyone, I am (your name). Are you happy?
Cardo (Card-oh) Is japanese for Card. Might help.
Most japanese are very grateful if you just make an attempt to speak the language no matter how bad you fail at it. It's the effort that counts.
Also magic, if it's visual, doesn't really need words. You'll be amazed at how well an ambitious card translates into ANY language without the need to speak.
Don't forget your pleases and thank yous.
Domo Arrigato: Thank you very much.
(Doh-Moe Arr-Ree-Ghat-toe)
Onigai: Please.
(Oh-nee-Guy)