Hi ajg. There are few threads in this board. Also at the top of the message I posted a message with important contacts for biz cards.
In order to establish a seperate file and not include your personal CR for biz, then you have to incorporate the biz and get an EIN Number. After that you have to get a DUNS number. Then you can start apping for the biz cards. At that time you'll not have to provide personal guarantee or ssn to get the biz cards.
Difference between biz cards and personal cards, biz cards does not have the same consumer protection as personal cards. You have to look into terms.
It is easy to establish biz credit. I have 14 biz accounts in the time frame of last 6 months.
Good Luck with your new Biz.