You can start with a lean dataset from your ERP/MES: orders with quantities and due dates, routings and operations with setup and run times, and machine or work-center calendars and capacities. Add shift models for people and equipment, plus basic planning rules like freeze windows, WIP limits, and sequencing preferences. This is enough to build feasible, capacity-aware schedules and to replan quickly when something changes. As you mature, you can add material checks, maintenance windows, and skills or crew constraints.