Asked that way, you'll only get advice from someone who recognizes and has installed that template, and is willing to write a tutorial about it.
Might be better to include a link to your site and specific questions about what you want to change.
Start here:
Install the Firefox browser and the Web Developer plugin for Firefox. You can use those to see where in the stylesheet you change the styling of the various page elements.
Ctrl-Shift-Y will allow you to hover over a section of the page and see the class and id names for that section in the box at the top. The statements in the stylesheet that begin with # are id's and the ones that begin with dots are classes.
Ctrl-Shift-E will open the CSS editor and allow you to edit the stylesheet and see the changes in real time without changing anything permanently. An essential tool.
Some prefer Firebug, which does much the same thing.