InDesign CC cannot open Pagemaker files. You’ll need to use InDesign CS6 for that.
CS6 was the last version to convert PM files. As you have CC, you can download CS6 and install it too.
Conversions can be from pretty good to not so good. If you have embedded images, open PM and make them linked images and save a copy with a different name so the original PM file remains untouched.