Welcome!
I can't help you with Linux I'm afraid, but I might hazard a guess that for using the AV in/out connectors you would probably be best using the Mac OS.
As for the network adaptor, there are AAUI to RJ-45 transceivers cheaply available for use with these machines. They are similar to the AAUI >> thin coax transceivers except they are more compatible with the modern standard. Some transceivers have both RJ-45 and coax connectors but these are more unusual. Alternatively you could install a NuBus ethernet card with an RJ-45 connector - again these are available cheaply. Some other members may even be able to provide you with them, (see the Trading Post forum).
I can't help you with Linux I'm afraid, but I might hazard a guess that for using the AV in/out connectors you would probably be best using the Mac OS.
As for the network adaptor, there are AAUI to RJ-45 transceivers cheaply available for use with these machines. They are similar to the AAUI >> thin coax transceivers except they are more compatible with the modern standard. Some transceivers have both RJ-45 and coax connectors but these are more unusual. Alternatively you could install a NuBus ethernet card with an RJ-45 connector - again these are available cheaply. Some other members may even be able to provide you with them, (see the Trading Post forum).