It isn't a tutorial just for ASP....that is probably what is not stated clearly enough in the very long instructions. Like i said, we intend to update these in the near future.
The Getting Started Guide for eCart covers all the server models eCart works with. For eCart 4, it works for ASP-JS, ASP-VB, ColdFusion, and PHP. You will notice at the bottom of pg 13, the instructions for PHP. If you are not already committed to using ASP, these are the instructions i suggest you refer to.
Also, if you are completely new to MySQL databases and PHP, i suggest you download and watch the Database Starter Kit for PHP we have for free on our website right now.
Don't be scared, but you may need to be patient. eCart is one of our more complex product's because of the need to get your database setup before you can begin.