Good question. Odds are that you need very little, starting out.
As I've reminded you in past chapters, the more a page contains, the bigger its file. Pictures (and picture backgrounds) dramatically increase the amount of space a page requires (and the time it takes to appear to a visitor). Sound, video, and large file downloads also might dramatically increase the amount of space you need.
If you have followed the tips I've offered for keeping the performance of your page sprightly, you'll find that each page occupies very little space. A basic pagea screenful or two of text graced with two or three small picture files and maybe a picture backgroundtypically requires less than 100KB of server space (often much less). You can store at least a dozen such basic Web pages in 1MB of server space. (There are 1024 kilobytes in a megabyte).
Most Internet providers and online services supply at least 3MB of free space to each customer; many supply as much as 10MB. That's enough to store 100 basic pages and have a few megs left over for a short video clip or two.
The following example shows how to determine the minimum amount of disk space required by your page files.