1. First of all, before selling Barbie dolls, you should check the trademark rights, copyrights, and patent rights of the goods in advance.

2. Secondly, after checking clearly, you need to register your own trademark and related copyrights to avoid trademark infringement issues.

3. When selling products, you should pay attention to the actual photos of your products, which must be real to avoid copyright infringement issues.

4. Finally, attention should be paid to the appearance design of the product. You can check it on patent-related websites to avoid patent infringement.