Multisite Product Sales Setup

I'm looking to sell physical products on eBay, Etsy, Facebook, and Shopify. I need help setting up and managing these sales channels. Key Requirements: - Set up product listings on all four platforms. - Integrate or set up an inventory management system. Ideal Skills and Experience: - Experience in multi-platform sales. - Familiarity with eBay, Etsy, Facebook Marketplace, and Shopify. - Strong organizational skills and attention to detail. - Experience with inventory management systems. Looking forward to your proposals!