Windows 2000 & routers

I have a small office network with win2k server running
DHCP for about 15 pc’s. I’m adding DSL for Internet
access and need to know the best way to implement
the Netgear FM114P wireless firewall router to the
network.
I connected the DSL modem to the router on the WAN
port and then the router to the switch. I turned off the
DHCP service on the router and left the default Lan IP
on the router as 192.168.0.1. But, I couldn’t get to the
Internet. Can someone give me step by step
instructions to set this up? Thanks