Help me set up my filter please

Hello everyone,
I would like to set up my 15 gal. aquarium after years of it lying around my house fishless and empty. I have a dynaflo 20 HOB filter that i have been using but i want to try a different approach with adding media.

My filter is intended to be used with the ever popular carbon filter cartridges but i would like to add some more biological power to this filter by including some form of "layerage" of different filter media. The problem is that i lack the innovative brainpower in order to make this filter do what I want it to. Here are some pics for you to see what i will be working with.








The water flows in just above the impeller and so rises and overflows out the lip, so i am thinking the media will ave to be placed for that bu tI am unsure if i will need separations for each media type or how exactly to place them in the filter so that all this would make sense.

I have been tirelessly searching online for pics on how power filters are layered with different media but to no avail. I however noticed that the aquaclear line of filters use a Basket type unit that holds diffeent media but i am not sure I can adopt that concept to suit this filter because i am unsure of the flow pattern required for such a setup. Can anyone help me out with this? It would be cool if i could do this without having to buy a whole new filter because this one performs really well.