confused with openvpn

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http://www.linuxquestions.org – I have already posted a different question regarding a problem i have with openvpn but i think i realized i am a bit confused. I have a LAN which consist of one server (centos) that is running apache and openvpn server and another PBX-VoIP server. I have added a link with a brief sketch, demonstrating my LAN. http://i.imgbox.com/aczI0yr6.jpeg What i want to do, is, when i am outside from home, to be able to access my LAN`s services from internet using OpenVPN. For example, when i connect with openvpn FROM INTERNET to my LAN, i want to be able to open firefox, enter (LAN s (HowTos)