I would like to thank Mike from HTPCguides.com for assisting us with migrating our servers to Linux, optimizing their performance and hardening our complex infrastructure in order to get ready for our KickStarter.
We used two guides in particular:
http://www.htpcguides.com/install-configure-configserver-csf-firewall-security/
http://www.htpcguides.com/install-wordpress-on-raspberry-pi-with-raspbian/
(no, our servers are not running Raspberry Pis, we used the 2nd guide to install and configure nginx and WordPress)
Thank you again Mike!