Easiest thing would be to buy a combined router/hub/wireless access point. I have one, works great, got PCs wired into it and PCs on wireless plus it plugs straight into the phone line and does the modem bit and some firewalling.
You're looking for something like
this on ebay, at 20 quid its the easiest thing to do.
Mr. Tibbs hits the nail on the head when it comes to what happens if you help the environment.
You'll be a fucking hero and some sort of tree-hugging yoghurt-weaving organisation is bound to reward you with free sandals and worry-beads for the rest of your low-impact environmentally friendly life.
Every man should have a shed where he can potter, Visordown is my shed on the internet