Since you want to have a firewall, the ether from school will go directly 
to the firewall,
whether it be a 486, your current desktop, or some nifty router/firewall 
device.
You mentioned your router:  most are simple, but if yours has a built-in 
firewall and
dhcp server like the linksys etherfast product, you're set.  If your 
firewall is a PC,
then the 2nd ethernet card in that system will go to the router, which 
will be your local network.

Cheers
     Ben

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