The detailed steps for opening an Amazon online store include registering a seller account, choosing a sales plan, creating product lists, setting prices and inventory, developing a logistics plan, promoting and marketing products, etc.

The fees include registration fees, sales plan fees, commodity sales fees, logistics fees, etc. The specific fees depend on the sales plan and product category, and are usually a certain percentage of each sale. Costs that need to be considered also include marketing, inventory management, and after-sales service.