Hello Mate,
I am an experienced eCommerce developer, mate I have used various eCommerce CMS like Zencart, Magento, Opencart, Woo Commerce. But I believe that Opencart is the best CMS instead of Zencart.
Opencart also have admin section from where you can manage shipping, payment gateways, orders, newsletter, mail, customers, coupons, discounts, products, categories, product options and many more advanced features.
Lets discuss more about the project.
Kind Regards,
Pankaj Modi