Thanks, Thomas! I figured out I needed to use the SAP/cloud-hana-shine-sp8 repo for the trial account. I was impatient before and didn't figure out how to rename all instances of {{PACKAGE_NAME}}, not just in the .hdbrole file. That and a few hangups with the naming of projects including dashes and I am off to the races!
Also, I am able to call my service now. Not sure what I did differently, but I renamed my Entity from Resource to ProtectedResource just in case there was a potential reserved word conflict. That and restarting my computer seemed to do it.