I need to change the Account Creation form by adding Company Address and Phone information to the form. I've already figured out that I'll need to modify the ..includes\templates\template_default\templates\tpl_modules_create_account.php file. Can anyone tell me what other files will need to be modified? Also, will I need to add additional fields to existing database tables? If so, which table will these fields need to be added to.

Thanks in advance for your help