Create an online store with various products. If a customer comes to your site and is interested in some of the items, he will place an order.
Upon the receipt of the order, your system will forward the order to the manufacturer who will ship the goods to the customer.
You do not need any inventory and you can automate the processes.
Creating a Shopify store with products from Aliexpress is what many others have done.
Concider using Oberlo app in your Shopify platform.
Oberlo is an app plugin for Shopify that fulfills the orders for you.