I suggest you try to follow one of the guides to installing LAMP on Debian Etch, for example:
LAMP on Debian (Etch)
or
Install LAMP server in Debian, Ubuntu, and CentOS
or this older example:
The Perfect Setup - Debian Etch (Debian 4.0)
If you don't like those examples, you can
Google for install lamp debian etch and find something that suits your requirements.