Instructions
Turn on your Xbox 360 and sign in to the profile you want to use as a new gamertag. If you do not have any profiles, create one by pressing the Xbox logo button on your controller and choosing "Create Profile."
Press the silver "X" button in the center of your controller. A menu appears.
Select "Join Xbox Live" and choose "Yes" when an "Exit Session" prompt appears.
Choose "Sign Me Up" when the "Welcome to Xbox Live" wizard opens.
Enter your email address and select "Continue." A Windows Live ID account creation screen appears. In the future, you will use the Windows Live ID to manage your Xbox Live account.
Enter your desired Windows Live ID password into the "Password" field. Enter the same password in the "Confirm Password" field and select "Continue." A "Secret Question" prompt appears.
Select a secret question from the list. This question appears if you ever forget your password for your Windows Live account.
Enter the answer to the secret question and select "Done."
Enter your date of birth and select "Continue."
Review the "Xbox Live Terms of Use and Privacy Statement" and choose "Accept." Choose "Continue." A "Gold Subscription Plans" page appears.
Choose a subscription plan. If you want the free membership -- which does not include multiplayer access -- choose "I Don't Want a Gold Membership." Enter your payment information if you opted for a Gold membership or select "No, Add it Later" if you chose a free account.
Fill out the "First Name," "Last Name," "Phone Number" and "Contact Email" fields and select "Continue" twice.
Choose an option for your Gamer Zone: "Recreation," "Pro," "Family" or "Underground." Select "Continue" twice. A keyboard appears on the screen.
Enter your desired gamertag and select "Done." If another Xbox Live user already has the gamertag, your Xbox displays a list of similar but available gamertags. Choose one from the list or select "Create New Gamertag" to try a different one. Choose "Continue" when you have chosen an unused gamertag. Xbox Live creates your gamertag.