PHP Chron Jobs Mailer Program

I already have a bulk email mailer program but it needs the Chron jobs either created from scratch or activated. You must know PHP + PHP Mail Functions. The person who installed my program didn't finish the job so I need this finished. The Chron Jobs will make it so that I can send my bulk mail on a scheduled date and time or once a day or once a week, or once a month or once a year. The perfect price is under $50 because for someone who knows what they're doing, this is a very quick job.