I am unable to size my logo correctly,as of now it is just in the right corner of the banner. I have tried re-sizing it but it keeps coming up the same size. I would like it centered and larger but seem to be unable to do so. Any help would be appreciated

You'll want to edit the CSS reference to #main_logo.

The current rule on your site is

#main_logo {style.css (line 55)
background:transparent url(http://dkpfiles.com/cod/logo) no-repeat scroll left top;
height:128px;
left:0;
position:absolute;
top:0;
width:600px;
}

You can change the location. Maybe by changing it to the following:

#main_logo {style.css (line 55)
background:transparent url(http://dkpfiles.com/cod/logo) no-repeat scroll center top;
height:128px;
left:0;
position:absolute;
top:0;
width:100%;
}

That'll center it for you. IF you want to make it taller, you'll want to change the height as well as change the "top" properties for #header ul and the height for #header.