If you look at the header in this content section you'll see the h1 tag. You'll use this when you want a new header. The headers for the navigation are different (h3 tag, for right align) so keep this in mind when you want to add a new section there.
If you want to change the font or any colors go to the style.css page. There you can make the changes from the size of the words to the colors of the links. Make sure you upload that document or the site will have the basic Times New Roman 12 font.
If you would like to change the title text to something else, simply download the the zip file and send me an e-mail with the what you want for the title. I will send you a modified version of the "haruscalling.jpg" image, in which case you delete the image in the zip file and replace it with the one I give you.
Last but not least, make sure you watch the height of your page and the width of your content. If you have lots of info it might run over at the bottom and if you have a big banner it won't fit. The width of this content area is 475 and the height is 500. If you want to change it or shorten the page then ask me and I'll tell you if you need help.