Changing the category view for Thematic theme

I’m not quite sure how to go about doing this. What I want to do is get rid of everything that shows up when you’re looking in the category view, except the title of the post that is. I would also like to change the font size of the title as well as how many posts appear on one page in the category.

I already copied the default.css into the bottom the style.css, although I do not see anything there that could help me with this big problem of mine.