You were on the right track until the phone got stuck. No worries, we will have you sorted out and on happy path.
First off pull the battery then while pressing Volume Down +Home+Power. Keep on pressing the buttons until you see Downloading Screen. This is called the Download Mode on your phone.
Next, please download PC Version of the Odin making sure the version is 3.07 or higher. Remove Kies or Odin won't connect to the phone. Also download the correct STOCK firmware for your phone. You can flash it via Odin on PC. Here are a few threads that will help you in this direction.
I believe that's a AT&T variant of Galaxy S4. So this thread [INDEX] All things AT&T MK2, NB1, and NC1 (including ROMs) should help. That forum also covers Canadian Variants of S4 as well just so you are aware.
Lastly, please feel free to post in [GUIDE][INFO] The beginner's info thread (aka. the noob helper)
if you find yourself still stuck.
Here's a Video Tutorial for your benefit. I know its not the same device but the steps are the same.[VIDEO] --- Odin Tutorial ---
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