Trying to build a schedule plugin with now and next feature

Hi
I’m trying to build a weekly schedule plugin that displays the schedule on a page for a radio station that also allows me to retrieve the current show, next show and the show after that to display in the header and home page.
I have looked at many current schedule and timetable plugins unable to find one with this extra feature and am unsure if it will be best to try and alter an existing plugin or start from scratch.
I understand how a lot of php works and was wondering if anyone had any hinters as where to start with this project?

Thanks