If the console was bought brand new then you can create up to 3 separate accounts (gamer-tags) and get one free month of Gold on each.
Make a new account using the console and if it is a new unit you will be good to go.
Turn on the console.
Make sure no accounts are signed in.
Select 'join Xbox LIVE'.
Follow the on-screen prompts.
Select free membership (silver).
At the end of the process you should be asked if you would like 1 free month of Gold added to your account.
Be sure to use a wlid (E-mail address) that is not tied to another LIVE account as 2 can not share the same wlid.
If you have any problems let us know. :)
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