I want to know exactly how to place a PDF file (be it an ad or a document with stats or data) onto a page in "In Design" for publication in a newsletter or newspaper.
You posted in the Acrobat.com Developers forum. I think you have a much better chance to get answers if you ask in the InDesign forum.
File > Place… Select a PDF
Best practice is to use PDF/X-4 or any PDF with live transparency and layers in InDesign as you can turn on and off layer's visibility with import options.