Macro for Google Sheets

I have invoices generated in a google sheets file, I need a quick way to print to PDF only the tabs that have invoices and name each saved PDF a specific invoice number, I want a one click solution, not sure this is possible. Once the Macro is made, I would like you to teach me how to put it in my file myself, and a general explanation of what was done just n case I need to do minor changes later.