Couple configuration questions

I need help in adding a background image under my logo. I noticed on the new_vision_blue skin they have a PNG image 12px x 127px called header_bg.png that goes across the top of the page. Im using the default blue skin and want to use the same image with the same results. Where do I go to get stated? I’ve tried design mode but with no luck.

Also, how do I go about finding what the default font is? Example would be the font used under categories. When I add my own code I cant seem to match up the same font with the default blue skin. I want to give a consistent look and feel to the site.