Set up an automated text system that texts people when they are on duty

I have a list of people that are on duty and a separate list of telephone numbers in my mobile. Trying to set up a system that will automatically text the person on duty. Is it possible to link up the automated system with the mobile numbers in from my mobile so they automatically text the number with a message. I am looking for someone with experience of setting up a system of sending out a group text message from a list of rotas or anyone who can use a system that automates this process I would like to start work on this within 2 weeks