If your mac has 'Airport Extreme' then you're probably best getting a wireless router, hooking the pc to the router and letting the mac find it on it's own (which it can and will do)
And from there, follow dragons advice. Right now, I can't remember the 'how to share between two computers thing' where one comp is a mac (I'm still a n00b to macs.. lol
)
but yeah, you'll get there eventually...
