I have an Applescript that simply opens a Dialog Box, asks for a user input and runs a Terminal Command and spits out the answer. It works great in AppleScript Editor yet I am trying to work out how I could package this Script File along with an icon to make a Mac App for my personal use. Thoughts.
In Applescript editor File->Save As and choose File Format as Application.
Open Bundle Contents drawer and see the applet.icns file, copy your icon to that.
See "Saving a script as an application" in Applescript Editor help.