This is pretty easy on any home user based router..pretty much they usually all start of the DHCP address range after .100 which means you pretty much have 99 static IP address to choose from since they will not be given out.
I usually give my server something like 192.168.1.10 and all the defaults you have set for the subnet mask and gateway address.
However if you are running a windows 2003 server I would assume you would want to use DHCP on it as well? If so remeber to disable DHCP on the router or there will be big problems for you.
The static IP addresses on your network all depend on your DHCP scope so we would need more info on that part