To handle international shipping and logistics on ecommerce marketplaces, start by selecting a reliable shipping carrier that offers global services. Ensure your products comply with international shipping regulations and customs requirements. Use marketplace tools to automate shipping processes and provide accurate shipping costs and delivery times to customers. Clearly communicate your shipping policies and estimated delivery times on your product listings. Track shipments and provide customers with tracking information. Consider using fulfillment services offered by marketplaces like Amazon FBA or third-party logistics providers to streamline the process and manage international shipping efficiently.