Change Creloaded website header

We require some amendments to our website. The site has been copied from another domain and we need to change any references (Web/Email address etc) to the new one. There are also some design updates we would like. The header has buttons on it, which need to work when the page is wider as well as when it is narrow. When there are no large images on the page the buttons are next to each other, but when some larger images are on the page the page stretches, but the images do not, so there is a gap inbetween them. We need to update the email link in the header The logo position needs to be adjusted slightly. Where product images are not available, we need to default to a standard "Image coming soon" image We need to update the contacts page to include new email addresses/office addresses We need to change the colour scheme of the whole site from light blue to dark blue (to match the logo)