Network Setup

Respected Helpers
First of all I really appriciate and thanks for your help in providing complete information in related to our Questions.
Here is my Question and i am providing you my requirement in detail. I want to setup small network which contains 1 Server, 10-20 Clients.
1)I want to configure this server for all clients
like Active Directory,dns,dhcp,wins, user policies, group policies, printer sharing, files sharing, and the most important internet connection sharing.
Now, My Question is how to setup this network in the most effective way and
Second, how to make internet connection sharing
Please provide my complete and step by step process for my queries.
I really thankful to you.
Hans