WordPress Theme DFire

I am running WP 2.0.4 and the DFIRE theme .. 1.0 i assume is the latest build. I wanted to make a few visual changes.

1) I’d like to change the Font and Font Size of the blog posts that show on the main page. I think its the style.css i have to edit .. but what part of it should i change ?

2) The titles Categories .. Archives .. etc .. if i’d want to chance their Font and Font Size .. what do i change in style.css ..

3) The blog post titles and numbers that show .. i wanted to change the Font and Font Size of that too …

4) The header links on top .. home .. about .. etc .. i wanted to change the color to something darker .. which line should i edit in style.css ?

5) And lastly .. i wanted to remove the “view related topic” drop down .. which files and code do i have to edit to take it off ..

Thankx in advance ..