I am going to buy an i pad soon and i was just wondering....

FaceTime is Wi-Fi only...

Using FaceTime

http://support.apple.com/kb/ht4319

Read & watch these and you'll be ready for your new iPad.

You can download a complete iPad User Guide here: http://manuals.info.apple.com/en/ipad_user_guide.pdf

Also, Good Instructions http://www.tcgeeks.com/how-to-use-ipad-2/

Apple - iPad - Guided Tours

http://www.apple.com/ipad/videos/

Watch the videos see all the amazing iPad apps in action. Learn how to use FaceTime, Mail, Safari, Videos, Maps, iBooks, App Store, and more.

iPad How-Tos
http://ipod.about.com/lr/ipad_how-tos/903396/1/

You can download this guide to your iPad.

iPad User Guide for iOS 5

http://itunes.apple.com/us/book/ipad-user-guide-for-ios-5/id470308101?mt=11

 Cheers, Tom 😉