Configuring ISDN – LAN Connect

We have a Cisco 766 ISDN Router.

IPs are 213.42.103.144-151
subnet:255.255.255.248

need to know >>>
1. HOW to connect ROUTER to SWITCH/ SERVER.?
2. What IPs cannot be used, eg. the first IP goes to Network ID, etc
3. What IP should be given to ROUTER and SERVER.

We have a Windows environment.

thanks.