Your billing address and credit card need to be in the country where you purchase.
An Internet connection is required the first time you install and license your desktop apps, but you can use the apps in offline mode with a valid software license. The desktop apps will attempt to validate your software licenses periodically, so you will need access for that. You should be able to use the apps while traveling.
For details on what to do if you move for an extended time, please work directly with our support team athttp://adobe.ly/1d3k3a5.