@lesimi:
1. You can adjust the padding-top in the following css as per your need and then add it in “Appearance => Theme Options => Custom CSS” box:
#main { padding-top: 40px; }
.no-sidebar .hentry { padding-top: 30px; }
2. You can adjust the padding-top in the following css as per your need and then add it in “Appearance => Theme Options => Custom CSS” box:
#header-content { padding-top: 40px; }
3. I don’t see any footer there
4. You can add the following css in “Appearance => Theme Options => Custom CSS” box:
img[class*="align"], 
img[class*="wp-image-"], 
#content .gallery .gallery-icon img, 
img.wp-post-image, 
img.attachment-thumbnail {
    border: none;
    padding: 0;
}
5. That administration bar is from WordPress core and it will be visible only to admin user and not for visitors. So, no need to worry about it.