How do I install dependencies for commerce using the Composer manager module I installed the composer manager module and enabled it. I have tried initializing it from using drush in the command line and failed using the command drush composer-manager-init.

I am confused on how to add the libraries intl, address, pricing and tax to my site.
Please refer to our installation instructions for Commerce 2.x here:

http://docs.drupalcommerce.org/v2/getting-started.html

Note that we recommend the Drupal console project, not drush. However, the linked Composer Manager instructions in there may help you do it via drush.