Go to the Amazon developer console
Select your app
Define a title and an SKU for your IAP. This is the SKU of the group (similar to Apple subscription groups) that holds the different prducts (monthly, yearly, …)
Define titles, descriptions and images that will be displayed in the store and set the translations to your markets.
Add new terms to distribute your products. A term is a time based variation of your product within your group (weekly, monthly, yearly, …)
Set the pricing of your terma and
Submit your IAP