Linksys router, Vista computer, wireless XP computer setup?

My XP currently is wirelessly linked to my Linksys router (which connects to the internet via my wireless internet provider). My new Vista computer (not wireless) is wired to my router. Both share an internet connection thru the router. I want to network my two computers. Can someone please give me a simple straightforward step by step procedure for setting this up. Help files so far have been no help. Thx