Header Navigation CSS

Hi

My site is clonesnclowns.com and my theme is Under the Influence + Twenty Eleven on the Images section

I’m having great difficulty getting my whole header image to show + moving the navigation down

I would also like to remove the dots on the navigation menu

I’ve tried everything I can find on the forums already, no luck..

I’m a CSS beginner so go easy on me 😉

Thanks a lot for your precious help