Some Issues with my Theme

Hi Guys, i have the catch responsive pro theme and i'm fallen into some issues. 1. how can i make the navigation bar transparent 2. is it possible to stretch the Header-Image over the full screen size? 3. Where can i change the font of the navigation? I know how to change it into bold but not changing the font 4. is it possible to replace the header picture for the Slider? I can only use header image AND slider below. 5. how can i stretch the content window? Best regards Stefan btw. the page is www.it-service-lange.de