Also, one the devices are paired, you then need to read the data from the headset. Do you know what format that data is in? What do you intend to have the Arduino do with the data, if you are able to get it?
The data is supplied in asynchronous serial stream packets, according to chipset documentation. There is already an Arduino sketch available online for acquiring and parsing packets.
Once acquired, the Arduino will move a team of servos in response to the values output by the headset. I've created a full post over on the collaboration board detailing the entire plan (I never fully expected to complete it on my own, as I'm no programmer; I just wanted advice as to which would be easiest to get running here).