Firewalls use standard conventions when referencing areas of the network. There are four basic network types, all of which can be managed by the firewall at the same time. These networks are called:

Red (external Internet)
Orange (DMZ or DeMilitarized Zone)
Green (internal network)
Blue (wireless network)
More details here

I'd like to build something like this in the coming months.

Problems associated with building or assembling the hardware (server) compatibility issues and installing the software would come later on.

Right now, I'm in the process of building the infrastructure side (wiring up all the rooms involved using CAT5E). All wires would run to a small utility room where a utility box would hold the router, dsl modem, switch (future upgrade) together in a bunch. The server would be placed in another room. Will those Red, Green, Orange, Blue, network implementation etc... (as mentioned above) be compatible with this kind of wiring? What is correct? Should I rewire or add more wires/lines?

Hope anybody with experience with this kind of matter can contribute to this thread. Your help is highly appreciated!