To use a Google spreadsheet as your data source, you will have to publish the spreadsheet, which makes it viewable by anyone with the spreadsheet's URL. Maybe in your case this isn't a problem, but with many shipping companies, all a malicious user needs is a tracking number to determine time and location of delivery, which makes theft a possibility.
Assuming that's not an issue here, you would create a Google Doc's spreadsheet with columns for all of the fields you want to track, and then populate the rows. Publish the spreadsheet by going to File -> Publish to the web. Follow the instructions
here (skip step 2 in your case) to get the spreadsheet URL and
here to set up the query in javascript.