Could someone please tell me how to insert a terminal command into an "application" so when the app is clicked/opened the command is launched?
Open Automator and choose Application for the document type.
Add a Run Shell Script Action.
Add your command line to the Run Shell Script Action so it's the only command in the action.
Save it as an Application to the desired location giving it whatever name you want.
Instead of an application, you could always try writing a bash script.
To write and run a bash script, there are a few things to do: