Read (beginning of) https://documentation.magnolia-cms.com/display/DOCS/Magnolia+npm-cli and please follow the installation instructions until you have a running version of the Magnolia npm-cli tools on Windows.

ruths, please check whether you find differences in what i have written while i was using OS-X (or what Martin may have added while trying out on Linux) for the sections Installation and Bash autocompletion.
The default windows shell is not a Bash, so Bash autocompletion will not work, i think there is no .profile file on windows ...

Try out the commands help and create-light-module, but please do not edit the commands section of the page yet.