If you don't know OpenOffice.org, it is a free but powerful office suit (i.e. like Microsoft Office). I have been using it for over 3 years now and I still favor it over the alternatives for a number of reasons (smaller files, PDF export, etc).
If you're new to OpenOffice.org or office suits in general then you will find these Free OpenOffice.org training videos very useful. The videos are designed for beginners and they will get your up and running in minutes, literally.