Shopify Enhancements & API Integrations

I have a Shopify website that requires secondary development, mainly focusing on functional development. We mainly offer gift customization services. Currently, we need to add some new functions to the website.
Let me briefly explain the details of the task. I need to develop a new product listing page on Shopify. This page can list special products, and these products will have different product specifications from those displayed on Shopify's original products. Because my product allows customers to customize it, we also need to call a third-party API to integrate this special product. Customers can upload their own avatars, and it can generate a cartoon character design. Then, our factory will make dolls according to the customized cartoon character design. This is the general process. The special customized product mentioned here, I think it might require a new product listing function to achieve, because not every product needs this function, only some specific products do. Secondly, the orders under this special product also need to be separated from ordinary orders. So, a new order management page might be needed.
I will provide a detailed document to explain the path of this task. I need the assistance of a highly professional Shopify developer. They must have rich experience in backend functions.thanks