|When using a router, the router get's the static ip.|
All clients can have a dynamic ip via DHCP from the router, e.g. 192.168.0.x.
Theoretically, you can connect 253 clients to that router. Practically, the routers normally have only 4 ports an must be extendet by connecting another switch to that router.
So if all of your clients are acting as a workstation and do not provide any services through the internet, all clients can have dynamic ip addresses.
Assuming the router has a private IP 192.168.0.1:
The client should have:
IP address: 192.168.0.x (where x is from 2 to 254)
Gateway: 192.168.0.1 (the routers address)
DNS: 192.168.0.1 (also the routers address)
The routers public interface (WAN interface) must be configured with one of your static ip addresses, you got from your ISP.