[How do I?:] Make my hack modular?

I want to make my hack have the ability to instantly add plug-in code, in order to add extra feature via the admin cp. Much like vbadvanced and teh new vB 3.5. Unfortuantly(sp?), I have no idea how to do this. I'm not looking for the exact answer or anything...just some ideas on how to get this effect.

Here's what kind of effect I'm trying to get at:

vB Space consist of two main columns, each column having different modules. I would like

1.) For admins to be able to pick the order in which the modules should appear.

2.) For admins to add more modules to either the left column or in the right, and pick the order in which is should appear.


I'm totally lost on how to get this modular approach, so any help whatsoever is extremly appreciated!