It's really not as different as you fear.
Instead of php code, you write in VBScript.
Instead of mysql_* functions, you use ADO.
Instead of built-in error handling, you wonder why nothing appears at the browser.
The nasty part of it is that the various components you have to use (ADO COM, scripting, error handling, etc.) seem like they were thrown together without any kind of overall design (probably because they were...).
Here's a reasonably gentle tutorial:
http://www.devguru.com/features/tutorials/ADOandASP/adoTutorial.html