There is no one definitive answer to this question as there are many different ways to start an eCommerce business at Walmart. However, here are some general tips to get you started:
Choose a niche or product category that you are passionate about and that you feel you can compete in.
Research the competition in your chosen niche or product category.
Create a business plan for your eCommerce business.
Identify a Walmart eCommerce partner that you can work with to help you get started.
launch your eCommerce business on Walmart.com.