I just acquired a NIC for MAC, it's an
"Assante MacCom+ II E" etheernet
Asante is is just about the best company I know of. Lifetime warranty that
they stand behind, even on ancient products, full web site with drivers and
diagnostics, plus most of their cards work just fine with the Apple drivers
that comes on most Apple OS releases.
Cabling is normal ethernet, I'm not sure if that card needs a AUI adapter,
but that is simple too.
Software is simple too, $$$ commercial stuff like Dave to make the mac look
like one of the old PC boys, or stick with internet tools and run web or
ftp servers on the PC side.