3-column theme

Hello Everyone,
I am a newbie to Apache Roller so am turning to this listserv for help in
converting a 2-column theme to a 3-column one.  Can anyone guide me through
the process of changing the Andreas08 theme into one which has a
three-column layout where the side columns are fixed-width and the center
column is liquid?

I would also like to have the tags cloud placed in the upper right side of
the blue banner area. I am having some difficulty understanding where to
place the div ids.

Many thanks,
Ann