An excellent choice for adding images and slideshows to your WordPress Blog/Site is the NextGen Gallery. The plugin gives you options to add an image browser, image list, or flash slideshow to any post or page. The slideshow requires the JW FLV Player. So make sure to download the .zip file and save the player.swf file somewhere on your desktop. We can later upload this file to our WordPress Media Library and use it for the NextGEN Gallery slideshow.
For now, watch this short video to get acquainted with adding images and displaying an image list.