The process of opening a store and selling things online may vary from platform to platform and country to country, but here are the general steps:

1. Choose an e-commerce platform: First, you need to choose an e-commerce platform such as Amazon, eBay, Taobao, JD.com, etc. These platforms have their own advantages and disadvantages, and you need to choose one based on your products, market positioning, and target customers.

2. Register and create an account: After choosing a platform, you need to register and create a merchant account on that platform. Usually, you need to provide some personal information such as name, address, phone number, and email address.

3. Set up a store: Once your account is created, you need to set up your store. This usually includes choosing a name and domain name for your store, and then setting up categories and tags for your products.

4. Upload products: Next, you need to upload your products. This includes providing detailed information about the product, such as product name, description, price, size, weight, etc. You also need to provide high-quality product images so that customers can better understand your products.

5. Processing orders and shipping: When customers place orders in your store, you need to process these orders and arrange for shipment. Make sure you comply with the platform's shipping regulations to avoid any possible penalties.

6. Providing customer service: As an online store owner, you need to provide excellent customer service. This includes answering customer questions, processing returns and refunds, and handling any possible disputes.

7. Marketing and promotion: In order to attract more customers, you need to market and promote your online store. This may include using the platform's advertising system, promoting your store on social media, or attracting new customers through means such as email marketing.