Start with the operating requirements
Before moving inventory, document SKU dimensions, packaging instructions, channel rules, and any special handling. Include the difficult orders as well as the typical ones. A clear baseline makes it easier to compare the new workflow with the current operation.
Test the complete journey
Validate a representative order from storefront import to shipment update. Check inventory changes, bundled products, address exceptions, and cancellations. Agree who owns each exception before the first live orders arrive.
Launch in a controlled sequence
Set receiving milestones, inventory reconciliation steps, and a cutover plan. Keep an explicit checklist for launch readiness and review exceptions closely during the first operating cycles.