If you are just getting started with ISA Server you might find that its hard to tell where the place is to start. One place you could start is by using the Getting Started Wizard. You can access the Wizard by opening the ISA Management console and clicking the topmost node in the left pane. Be sure that you have Taskpad view enabled by right clicking on an object in the left pane, then going to View and then click on Taskpad.
ISA Server was designed for the Windows 2000 platform, taking advantage of advanced OS technologies including management, networking and authentication services. In addition, Windows integration makes it easier for administrators to work with other Microsoft applications like Exchange and NetMeeting.