Rather than trying to interface a usb dongle to your project it may be easier to use a dedicated bluetooth chip as these will give you serial data and do the majority of the hard work.
I don't have any code but here is a datasheet for such a chip.
http://amx.co.uk/bluetooth.pdf
You basically need the chip an antenna (they make surface mount versions) and the rest seems straight forward.
Look around page 24 for interfacing info. I came across a Toshiba chip which only had 8pins which is a bit more managable but I couldn't find an english datasheet.
If you are in a real hurry you can buy rs232 BT dongles
http://www.psism.com/cs0400.htm
Rob
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