Setting Up DSL in a windows 2000 network

I have a windows 2000 network with active directory. I just got dsl (Yahoo sbc, dynamic ip address, modem included). I purchased a linksys BEFSR41 Router. I have 8 workstations that need to share the internet connection.

Currently, the workstations have a static ip addresses and the preferred DNS server is the windows 2000 server.
if my server’s ip is 192.168.1.5
my workstations use the the address ranges 192.168.1.40 – 192.168.1.50
The subnet is 255.255.255.0
Let’s say the router’s address is:192.168.1.6 and I decide to let the workstations get their addresses from the router.

What do I need to configure on the router and what do I need to configure on the server. Should I give the server internet access. I think the router has a built in firewall, is this correct?