One of the easiest ways to begin applying numbers is by starting to type a numbered list. Word recognizes that you are creating a list and responds accordingly by converting text that you type into numbered items. The number scheme, delimiter characters that mark the beginning or end of a unit of data and formatting are all based on what you have typed.
All of this happens in the Bullets & Numbering dialog box, shown below. You will definitely want to use paragraph styles for this. My first one is called Chapter title. You will need to begin by changing the List Type to Numbers for all of the levels, and you must both name the List and use the same named list for all Levels. You do this by selecting the List > New List.
I’m not sure which version of InDesign first introduced printing Thumbnails like this, but even if yours doesn’t support that, your printer driver may have a similar feature of its own. Check the printer’s own dialog box by clicking “Setup…” near the bottom left corner of the Print dialog and dismissing the warning, then clicking “Preferences…” in Windows’s Print dialog that comes up (I’m not sure how to access this on Mac OS X, but I’m pretty sure there’s an easy way). For instance, on many HP printers, the feature you want is called “Pages per sheet” and has a drop-down offering 1, 2, 4, 9, or 16 pages per sheet.
The above steps are the most basic way to add a very basic page number, but if you follow a few tricks then you could save yourself even more time and get the job done even faster. For one thing, the page number you’ve added is only for one page, and if you used that method you’d spend ages adding page numbers to the whole document. To add page numbers to all pages quickly and format them all equally, follow these steps: