E-commerce Section for Existing Website

I need someone who helps me building an e-commerce section on my existing website that includes more than 10,000 supplier products, along with availability, pricing, and automatic profit margin application. The goal is to create a new “Online Shop” section rather than launching a separate site. I already have a website, so the work should focus on adding this functionality within the current platform. The right freelancer should be able to handle product import, catalog setup, and ensure the shop is ready for customer use.