Add a Changelog (best named 'Changes') to the distribution. It should list at least major changes implemented in newer versions.
Add a MANIFEST to the distribution. Your buildtool should be able to autogenerate it (eg "make manifest" or "./Build manifest")
Add a META.yml to the distribution. Your buildtool should be able to autogenerate it.
Add a README to the distribution. It should contain a quick description of your module and how to install it.
Run a proper command ("make manifest" or "./Build manifest", maybe with a force option), or use a distribution builder to generate the MANIFEST. Or update MANIFEST manually.
Error: Cannot find MANIFEST in dist.
List all used modules in META.yml requires
This is not a critical issue. Currently mainly informative for the CPANTS authors. It might be removed later.