See Module::Release together with Perl::Version (resp. the perl-reversion tool in that).

I use a hacked up Makefile.PL to autogenerate the README and README.md files, but others use Dist::Zilla plugins or Dist::Minilla or Shipwright to do that.

Updating the Github repositories is as simple as invoking git push --all after the release. Module::Release does that I think.