Asterisk Administration - A2billing - FAX solution on Centos

I have a working installation of Asterisk 1.8 on Cloud server with Centos 5.6, with Freepbx 2.9, Webmin and A2billing last version. My plan is to sell bundle packages (no calling cards), so I need some customizations, like A2billing integrations with [login to view URL] Gateway, integration with features from freepbx like follow me, IVR and editions of Voicemail, etc. An installation of Wordpress to integrate with a2billing if possible (to ease the Design and SEO for the resulting website, keeping integrated the login with a2billing) Additionally, I need a Fax solution integrated, it could be Hylafax, but need the interface to allow customer to login like web to Fax, and fax to email. I have my Voip provider who has an API to use for some features. Also, some recommendations to harden the Asterisk server. If you have samples already working online, please, let me see or test a demo of those projects. I am web designer and know HTML and basic PHP, so I can do the design customizations. I'm in Need to expand my services into the VOIP area, so looking for an advise and assistance. Let me know to discuss details. Thanks.