hi - i'm a newbie non-techie and JUST getting started trying to set up a site/blog with wordpress for the first time. i'm using the Atahualpa theme and have what should be a very basic question that i'm not clear about... it looks like style.css is the "style sheet file" but it seems to have nothing in it while css.php looks like it has lots of stuff in it... which file do i look in and edit to change stuff like the top nav items/functionality, right sidebars, footer, top/banner image, etc. thanks so much for any answers!
jj