Change layout of header in WP default theme

My site is http://www.7circumstances.com, and I am completely new to .php.

First, I am trying to change the margins for the existing text. I’ve been testing the following code in the functions.php:
#kubrick-header #header .description {
font-family: ‘Lucida Grande’, Verdana, Arial, Sans-Serif;
font-size: 1.2em;
text-align: center;
}
I tried to add “margin: 20px;” (also tried other sizes, positive and negative, margin-left, etc.) below text-align: center;”, but nothing changes.

Second, I want to add a 150X150 photo to the left of the text, left-align both texts, and change the size of the title to fit the balance of the area.

Third, I would like to extend the header beyond the blog area on both sides, to match the width of the footer.

Fourth, I would like to move the seach box into the header.

Any and all help would be appreciated, as well as any reference to more detailed instruction than what is found in the WP documentation.

Vegard