Hi dodger
As you have discovered, there are lots of PDF creating software, and from free to the cost of a small car (joking but not so much so).
To create PDF’s from your documents and using office you have 2 fast options (both free):
1 - if you have office 2007 (and it just works for this version), get the Microsoft free plug-in to create PDF’s with office programs (go to the Microsoft site and search for “2007 Microsoft Office Add-in: Microsoft Save as PDF or XPS”);
2 - get open office, it supports saving in PDF by default and you can even launch it from a USB pen or a any external media if you do not want to install it on your computer (you can get it to be launched that way in
http://portableapps.com).
Concerning the scanner, yes almost all of today’s scanners have some software who permits the creation of PDF’s.