how to manage server?

Dear all,
i am the new member. i have one question about client and server. the ISP provide me one ip to access internet. i need to build Server and clients in star topology to acess internet from server that i build in local network. i install window 2003 server and ISA 2004. and clients are window xp service pack 2. and the server share speed internet to clients is limit like some clients are 64Mbps and other unlimited and another is 128Mbps. so please tell me how many step should i use to manage server.