Using SSL

I've checked this off as "Yes" and I have the SSL certificate installed on my server. However, is there a way to make the entire site https:// instead of http://?

I just went into the config.php file and edited

// HTTPS
define('HTTPS_SERVER', 'http://starcraftmecca.net/store/');
define('HTTPS_IMAGE', 'http://starcraftmecca.net/store/image/');

to

// HTTPS
define('HTTPS_SERVER', 'https://starcraftmecca.net/store/');
define('HTTPS_IMAGE', 'https://starcraftmecca.net/store/image/');

Is this correct in making it so returns and checkouts are secure?

Yes, that is correct. You may also want to edit the admin/config.php file in a similar fashion.