Starting an e-commerce business and earning money online involves several steps. Here is an overview of the process:

1. Identify a niche: The first step in starting an e-commerce business is to identify a niche market. This can be a specific product category or a group of customers with specific needs.
2. Research the market: Once you have identified a niche, research the market to see if there is demand for the products or services you want to offer. Look at what competitors are doing and what they are charging.
3. Plan your business: After researching the market, it's time to plan your business. This includes creating a business plan, identifying your target market, and determining your pricing strategy.
4. Choose an e-commerce platform: There are several e-commerce platforms available, such as Shopify, BigCommerce, and WooCommerce. Choose the one that best fits your business needs.
5. Create your online store: Once you've chosen an e-commerce platform, create your online store. This includes designing your store, adding products and categories, and setting up payment and shipping options.
6. Market your business: Now that your store is set up, it's time to market your business. This includes creating a social media presence, setting up Google and Bing ads, and doing email marketing.
7. Fulfill orders: Once you start getting orders, it's time to fulfill them. This includes packing and shipping the products, and handling customer service.
8. Optimize and scale: As your business grows, you'll need to optimize and scale your operations. This includes automating certain tasks, hiring staff, and expanding your product line.

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It's important to note that starting an e-commerce business takes time and effort, and there is no guarantee of success. However, if you're willing to put in the work, an e-commerce business can be a great way to earn money online.

Additionally, while the above are the general steps to set up an e-commerce business, you may need to consult with legal and financial advisors, and comply with the regulations of your country and state.