The balance would be $0.  It's the ability to get the card set up this way that you're buying - a degree of anonymity.  You can't walk up to a bank and get a debit card without giving the bank a lot of details.  This eliminates the need to provide those details to anyone.  It's a pure privacy play.

Like I mentioned, it *may* be possible to deposit funds from you on the card, but that involves a bit more due diligence.

Hope that helps clarify.