If you are interested in creating the QR for your own business card, you can follow two lines:
1.- Create a QR code containing ALL the information about your business card (see http://goqr.me)
2.- Create a simpler QR Code referring to a web platform that is the one that really contain your info. (see http://scan.me)
Pro’s & Con’s
Direct QR: you do not depend on anyone to have your code operative, BUT it is much darker and less attractive
Indirect QR: it is much more attractive, but it will only work if the Code platform works.
I strongly recommend Type 2 for marketing purposes.