To use Gmail e-mail service, you must create a new Google Mail account. Creating Gmail account is all free.
First Step Have you got any account already ?If you have signed any of Google services like Google Drive, Youtube, you can use Google Mail too.If you dont remember your account, enter your e mail adress which you remember on password-assistance page. If there isn't any account connected this mail, you will see a message ; 'No account found with that email address' you entered.
Second Step Create a New AccountAfter being sure about have not any accounts in google, we can move to second step; Sign up.Gmail Sign Up