Need help Scripting

   I am a beginner at scripting, coding, and web design. I have been having questions regarding scripting.

I need help developing an Adobe Script that will 1)Automatically open a PDF file I have (created in Illustrator CC 2015)

                                                                              2) Automatically change the name of two swatches,  to new names I have

                                                                              3) Save with same file name plus "_Z.PDF" at the end

                                                                               4) Then close the file.