Header

The header section consists of the logo, the site slogan, the theme-configured search, and the header block menus (language switchers).

Top level menu text

> Another small Question, if I want to try to increase the text size
> in the top level menu tabs, where would I do it?

Open style.css in the theme folder.
Scroll down to the 'primary' section.
Find this block and edit the font-size value:

#primary a,
#primary a:link,
#primary a:hover,
#primary a:active,
#primary ul.menu li a,
#primary ul.menu li a:link,
#primary ul.menu li a:hover,
#primary ul.menu li a:active {
height: 48px;
display: block;
background: transparent url('tabs-left.gif') top left no-repeat;
margin: 0;
padding: 0;
font-weight:bold;
color: #00186C;
line-height: 3.6em;
font-size: 1.2em;
white-space: nowrap;
text-wrap: suppress;
}

Meta tags

Add them as you normally would to a HTML document, in page.tpl.php
just above the </head> tag at line 14.

If you need more granularity, this could be an option:
http://drupal.org/project/nodewords