I set up my domain http://www.lendadvisors.com & uploaded my Wordpress theme on my host, but receive an error, as follows:

"Fatal error: Call to undefined function: get_header() in /home/michelz/public_html/lendadvisors/index.php on line 1"

Also I set up a free Wordpress account for this purpose. So far I don't have any experience with hosting Wordpress on my host! How can I get things work? Thanks!

Are using an actual theme or just inserting code into your index.php file? The error would normally give a /wp-content/themes/name/index.php error if it was the theme file causing the error in question