[K12OSN] Squid / SquidGuard architecture

[bear2bar netscape net]

Hi,

OK I know this may yet be another dumb question but ...

Since the lab "lost" its DansGuardian system (School reappropriation ^ redeployment of equipment) I've had ongoing problems getting Squid & squidguard working.
So here goes..
1) Should this setup on a single server or two ?
1a) If one how ? I get everything blocked or nothing 
1b) If two what SW goes on which box & how are they tied ? 

2) Should  this/these servers be on their own switch/hub connected to the outside world & then anoother connection to a switch/hub for the lab ?

thank you for your HELP 

norbert

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