Adding an E-Mail Field

Hello, I need a PHP'er who can take a done HTML template and add an email field for people to enter their email address and then subscribe to some kind of mailing list. When visitors add their e-mail to the 'email' field and press the 'submit' button it sends an e-mail to a specific address saying "This e-mail '' has subscribed to your mailing list" and then entering the e-mail to "emails.txt" or something like that. Thanks