Andy, in case you're tempted - don't use jpeg for this project, it introduces artifacts and GIF isn't suited either.

TIFF is great and PNG.

If you are going to manipulate the images to try and improve clarity, etc, you may wish to scan at a higher resolution than 300DPI, then manipulate that then scale back down to 300DPI - really depends on whether you intend to manipulate the images or not.