For a novice, you can follow the following steps to open an online store on Amazon:

1. Register an Amazon seller account: Visit the Amazon homepage, find the seller center, and click Register to become a seller. Fill in relevant information, including store name, contact information, etc.

2. Determine product categories: Select the product category you want to sell on Amazon. You can choose based on your interests, experience, market demand and other factors.

3. Purchase products: Find reliable suppliers and purchase products for inventory management. Pay attention to choosing high-quality products and ensure that suppliers can deliver on time.

4. Create product listings: In the Amazon Seller Center, create product listings according to Amazon's specifications. This includes information such as product title, description, price, inventory, etc. Make sure the information is accurate, detailed, and includes high-quality product pictures.

5. Process orders and logistics: When customers place orders to purchase products, process the orders in a timely manner and arrange logistics delivery. You can choose to store your products in Amazon warehouses, use Amazon's fulfillment service, or handle logistics yourself.

6. Provide customer service: Maintain good communication with customers, and promptly answer and resolve customer questions and concerns. Establish a good customer service system to improve customer satisfaction. Optimize sales: Improve product visibility and sales through advertising and optimizing product pages. Pay attention to customer feedback and market competition, and continuously improve products and services.

8. Maintain account and financial management: Regularly monitor sales, inventory, and profits to maintain account health and good financial management.

It should be noted that opening an Amazon online store requires compliance with Amazon's seller policies and regulations, including product quality, after-sales service, etc. In addition, pay attention to market competition and consumer demand, continuously optimize products and services, and improve competitiveness. Throughout the process, regularly learn and understand Amazon's seller resources and tools, and continuously improve your own business capabilities.