Perhaps the simplest way to create PDF documents using Acrobat is via the Print command. Any application that features such a command will include an 'Adobe PDF' entry in its list of printers upon installation of Adobe Acrobat and this can be used to 'print' a PDF version of the active document.
Start the application associated with the document you want to convert as normal.
Open the file to be converted.
Go to File > Print and select 'Adobe PDF' from the list of available printers.
You will be prompted for a filename for your PDF and where to save it.
Once you've selected your filename and location, you're all done. Simple, huh?
OK, so you want to stamp your document. Maybe you need to give reviewers some advice about the document's status or sensitivity. This tip from author Ted Padova demonstrates how to add stamps with the Stamp Tool along with related comments.