Remote Desktop Protocol (RDP) is how you will administer to your Windows 2008 Server.
This tutorial will cover the basics of connecting to your Server using Remote Desktop Protocol.

Learn the basics here:

First go to
Start,
All Programs,
Accessories
look for Remote Desktop Connection – click it to Open and then see the illustrations below.

Using a Mac? No problem – head to the Microsoft site to download the Remote Desktop Client for the Mac.