In order to sell on Amazon, you must be a registered Amazon seller. To register, you will need to provide Amazon with your tax information and list of products you intend to sell. Once you are registered, you will be able to create listings for your products and fulfil orders through Amazon.
If you are already registered with Amazon and you have a physical store, you can apply to open an Amazon shop. Once your shop is open, you will be able to sell your products on Amazon.
If you are not registered with Amazon and you do not have a physical store, you will not be able to sell on Amazon.