You will need an adult to sign up for you and use their name, address, ssn, tax information, ect... You will not be able to change over the name of the account once you sign up. This is from personal experience when attempting to transfer an account Apple would not allow it (at least with an individual account).
I'm under the assumption that after the contract expires at the end of the given year that you may be allowed to change the information or you might just need to create a new account.
If you will be turning 18 fairly soon, you might be better off just holding off a little while before you sign up and just use the simulator to test your applications.