Offer stages a SaaS offer goes through in AWS Marketplace

When you create your product and the first version of your software, it's initially published in a limited scope so that only your account can access it. When you're ready, you can publish it to the AWS Marketplace catalog to allow buyers to subscribe and purchase your product.

Please follow the following document to publish your product

https://pages.awscloud.com/rs/112-TZM-766/images/aws-marketplace-ug.pdf

The steps may change according to your product type (AMI product, Container Product ...)