My god your making this sound excessively complicated.
Get your router. Get a switch.
Plug router into switch via any port.
Voila!
Working.
Its that simple. Ive set it up exactly like that several times.
ditto, infact at home theres the router connected to a hub in the loft which in turn is feeding two small 5 port switches in two bedrooms.
dont mess with a router for anything other than getting on the net, aint worth the hassle.