Display a Facebook Fan Box on your blog. Put the Facebook Fan Box in your sidebar using the widget mode or call the function inside your template.
Upload the entire facebook-fan-box folder to your wp-content/plugins/ directory.
Activate the plugin through the 'Plugins' menu in WordPress.
Visit http://www.facebook.com/pages/create.php to create a new page in Facebook. Edit your page and copy its Page ID from adress bar.
Use this information to call the function inside your template or activate the widget.