Adobe provides a healthy set of video tutorials on their Adobe TV site. Go there now.
If you're new to Connect, be sure to start with the "jumpstart" videos and go from there.
Clarix Technologies (our service provider for Adobe Connect) also provides some excellent video tutorials on Connect for more advanced users. This link will take you to them.
Here's a specific link about VOIP (Voice over IP) for Windows and USB headsets: http://www.clarix.com/voip.html