[development] how to start a drupal like project

[My Own Linux]

I want to write my own open source web application and make it as flexible
and usable as drupal. I have no experience with a project this size. How do
I go about it ? What do I need to do first and how do I plan the project ? I
dont know where to start. I need to know the core technical side of project
planning (not the hosting, cvs, etc..)

data structures
file system layouts
theme, modules support, etc..
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