Building Real Estate Website

When I'm trying to design this professional looking website, it just doesn't look up to par with the competition. We want this website to look like it's worth thousands of dollars. 1. I want a full width slider, is there some codes I can plug into the Custom CSS section so the slider fills up the whole page? Or do I have to use a plugin like Slider Revolution? 2. Is there CSS codes to put into Custom CSS section so the primary menu background color fills up the entire width of the page? 3. Is there CSS codes to put into Custom CSS section so the header background fills up the entire width of the page? Thanks