Background image header etc…

I have selected a background image in customizer but it is not showing up. If you look at my site now… I want the banner image to extend all the way up behind the header so that the logo and tag line are floating in the sky that is currently cut off and up behind the header that I would like about 50% translucent. I would also like the header to be about half as wide and the facebook and email icons to be on the right of the header, phone number on left. I do not want background image behind the interactive circle pics. I am a total newbie so please give step by step if you send me to custom css.
http://Www.fastidlemobileservice.com