(newbie alert) I've got some web building skills, and I need some orientation to WordPress. I'm having trouble understanding what theme I've got as default (I think it's Kubrick) where the CSS files for the Themes are located, and so on. It's like when I look at the admin controls, it's pretty much point and shoot. But when I look at the documentation, it's talking about files in directories, as if there were a way to manipulate all these files in a more "web builder mechanics" mode. I guess what I'm looking for is the entry point into that more technical mode. Where do I get at those files, how are they structured, etc.
Any help with this would be appreciated.