this apple id has not yet been used with the itunes store

Hello nader fitness,

This is expected behavior. Upon initial sign in to the iTunes Store (or a new iTunes Store region), you will be asked to accept the Terms and Conditions, as well as enter account information/billing information.

For more, please see the following resources:

Using your Apple ID for Apple services

http://support.apple.com/kb/HT4895

iTunes Store: How iTunes Store purchases are billed

http://support.apple.com/kb/HT5582

Thanks,

Matt M.