um, you can learn how to use CSS at
http://www.westciv.com , or very basics at
http://www.htmlgoodies.com . awesome stuff here
http://www.csszengarden.com/, and here
http://www.mezzoblue.com/.
as far as dloading a CSS for a site, that not really gonna work, as they are built for a certain site, not universal. you can get examples at the sites that i posted, but you need to create one for your own site. you could grab a CSS editor like Top Style, but its better to learn to write it yourself, then move to an editor for speedier dev.
there was somthing else i was gonna say, or post, but i can't remember it now.
one more thing though, risize your stinkin' avatar!!
later