At its simplest, you’ll need the following to Facetime:
1. The Hardware (currently the following hardware supports Facetime: an iPhone 4 or 4S, iPod Touch 4 or 4S, iPad 2, Mac with a built-in iSight (webcam). You and your Facetime friend will each need one of these.
2. Facetime App. If you are on a Mac, you’ll need a copy of Facetime (which you can purchase from the Apple App Store). If you are on an iOS device (iPhone, iPod Touch, iPad), the ability to Facetime is built in to the operating system.
3. A Facetime account. You can assign a phone number and/or an email to your Facetime account through your Apple ID. You’ll do this the first time you launch Facetime.
That’s the short version. What questions do you have about how to get Facetime up and running?