To open a store and sell goods on Amazon cross-border, you can follow the steps below:

1. Choose the right Amazon market: Amazon has markets in multiple countries. Choose the market that suits your target, such as Amazon US, Amazon Europe, etc.

2. Register an Amazon seller account: Go to the Amazon Seller Center to register an account. You need to provide relevant information, such as personal or company information, bank account, etc.

3. Find suppliers and goods: Find reliable suppliers and purchase goods suitable for sale. Goods can be obtained through domestic and foreign suppliers, wholesale markets, OEM factories and other channels.

4. Prepare product information and pictures: Create detailed product information for the product, including title, description, keywords, etc. Take high-quality product pictures.

5. Create a product list: Log in to the Amazon Seller Center, create a product list and fill in relevant information, including price, inventory, shipping method, etc.

6. Process orders and logistics: Once a customer places an order, process the order in a timely manner and choose a suitable logistics method to send the goods to the customer.

7. Provide customer service: Respond to customers' inquiries and questions in a timely manner and provide a good customer service experience.

8. Marketing and promotion: Increase product exposure and sales through Amazon's advertising services, promotional activities, etc.

It should be noted that cross-border sales involve customs, taxation and other issues. It is recommended to consult professionals or lawyers to ensure compliance.

I hope the above information is helpful to you. I wish you success in Amazon's cross-border sales!