I want (i did) split the center column in two columns and want to fill it

I divided the centercolumn into two colomns, Have a look at http://newspiration.com/news/ of the home page horizontal, on the other pages vertical. I did this by pasting the div structure into the text area.
But now I want to show a different category on each static page, and to make it more complicated, the last post of this specific category should appear (in full) in the left column and the last 4 posts should appear (image exerpts or text exerpts) in the right column. For older posts of that specific category, you should somehow end up in the specific categorie archive.

i used the technic offered here and changed the % to fixed withs.

It all workes fine but now I want to fill the columns with posts.

Any advice is apreciated.