Here are some steps and suggestions:

1. **Find suppliers**: You need to find reliable suppliers or manufacturers who are willing to let you sell their products. You can find potential suppliers by searching online, attending industry exhibitions, checking wholesale markets, etc.

2. **Establish a cooperative relationship**: After getting in touch with the supplier, you need to negotiate the details of the cooperation with them, including price, logistics, inventory management, after-sales service, etc. Make sure all the terms are clear and acceptable to both parties.

3. **Sign a cooperation agreement**: Formal cooperation usually requires a written agreement to clarify the rights and obligations of both parties. This helps avoid future disputes.

4. **Create a sales platform**: You can open your own e-commerce platform online, such as opening a store on e-commerce platforms such as Taobao, JD.com, Pinduoduo, etc., or sell on social media platforms such as WeChat, Weibo, Douyin, etc.

5. **Make product links**: Create a product page on the sales platform and generate a product link. Make sure the product description is accurate and the pictures are clear to attract customers to buy.

6. **Promote products**: Promote your store and product links through various marketing methods, such as search engine optimization (SEO), social media marketing, paid advertising, content marketing, etc.

7. **Manage orders and logistics**: When customers purchase products through your links, you need to manage the orders and ensure that the goods can be delivered to the customers in a timely manner. You can choose to handle the logistics yourself, or work with suppliers to have them ship directly (i.e. "one piece of delivery" service).

8. **After-sales service**: Providing good after-sales service and solving customer problems and complaints is crucial to building good customer relationships and word of mouth.

9. **Analyze and optimize**: Regularly analyze sales data to understand which products are popular and which marketing strategies are effective, and adjust your sales strategies and inventory based on this information.

In short, selling other people's goods requires compliance with relevant laws and regulations, ensuring that the goods sold are legal, and respecting intellectual property rights. In addition, maintaining good supply chain relationships and customer service is the key to long-term success.