Parse error: syntax error, unexpected '/' in /home/mwproperty/public_html/wp-blog-header.php on line 12

Answer 1

The final part of your require_once lines needs to be a string, because you're concatenating one of more strings to form another:

require_once( dirname(__FILE__) . '/wp-load.php' );
require_once( ABSPATH . WPINC . '/template-loader.php' );

Answer 2

Line 12 is the following:

require_once( dirname(__FILE__) . /wp-load.php );

You forgot the quotes (so it makes it a string):

require_once( dirname(__FILE__) . '/wp-load.php');