What is the Event ID code in the Windows Event Viewer that will tell me:
Server has started IIS has started
Is there a place online where I can look these things up?
You specifically asked about a list of Event-IDs. That now depends on your Windows (and IIS) version which you didn't provide. The free Windows 2003 Server Security Guide (see technet under Security Products and Technologies) lists quite a few of them and the second edition of the Windows Security Resource kit has a lot of information on auditing and event ID's. It is not free (see amazon.com) but worth a read.
Some general info on auditing can be found in the Security Monitoring and Attack Detection Planning Guide.