Securing my first CI website

[eluser]DumpProgrammer[/eluser]
I am almost finished on my website and I now need to secure the site because the tutorial I followed did not offer any security information at all and was taking input and directly storing it into the Database without any filtering.

I just wanted to know if I set this to true

$config['global_xss_filtering'] = TRUE;

then that means all input is filtered. So if I do that then all I need to do is perform a few additional measures like the links to my post to make sure they accept only numbers and also redirect users back to main page?