Sheila,
One way to create white space is to use margins and padding. You can create an external style sheet with assorted classes that you can pick and chose for use in your pages, or you can assign styles as you go through the pages.
If you have an image that you would like to have white space all around, but even have different amounts of white space, you could use some like this:
style="margin-top: 5px; margin-right:10px; margin-bottom:15px; margin-left:20px; border:0;" Just add this to your image code along with the width, height, title, and alt entries. A shorter code that does the same thing would be to use something like this:
style="margin: 5px 10px 15px 20px; border:0;"
The border:0; just turns off the border that browsers seem to place around images, but if you want you can specify all sorts of borders.
The main thing here is just to show that you can use CSS to set the style (white space) around your images.