How do you put your phone number on iMessage
How do you put your phone number as one of your iMessage numbers
iPad 2, iOS 6.1
Messages/facetime and assigning phone numbers
http://support.apple.com/kb/HT5538
You can watch this about assigning different email addresses to FaceTime and Messages.
http://macmost.com/setting-up-multiple-ios-devices-for-messages-and-facetime.htm l