This video will walk you through installing the Network Policy and Access Services role in Windows 2008 R2. Once installed I'll show you how to configure Routing and Remote Access to NAT your Internet connection. I recommend you watch How to Configure DHCP on Windows 2008 R2 (simplifies client access and eliminates having to setup your network connections on your clients manually). Also, Create a New Domain in a New Forest because at the very least you will need a DNS server for this to work. Setting up a Domain Controller automatically installs DNS. You can also setup a standalone DNS server for this to work; hopefully I can post a video showing everyone how to do that soon!