Codeigniter HTTPS (SSL) What is the "Best Practice"?

Hi
I have renewed my SSL certificate with Godaddy, I´ve been instructed to redirect my website to HTTPS by changing the htaccess file.

 <IfModule mod_rewrite.c>

RewriteEngine On

RewriteCond %{HTTP_HOST} ^www.example.com [NC]
RewriteRule ^(.*)$ example.com/$1 [L,R=301,NC]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?/$1 [L]
</IfModule>

The website when is redirected to https the website is completely different and not functional.

Could someone help me with this issue please?
Many thanks in advanced