Ramblings

First find a font of your taste somewhere, there are thousands of free web fonts out there, just search for "free fonts" in any search engine.

Then go into your account page, and select the Layout menu entry. Select a blog theme other than the default one. Then click on the link to add a personal CSS rules.

At the top of the form simply include the following:

/* Special font-face selector */
@font-face {
  /* "Nickname" of the font to refer to it later */
  font-family: "acoustic";
  /* Change the url to point to wherever your font resides */
  src: url("http://www.webpagepublicity.com/free-fonts/a/Acoustic Bass.ttf") format("truetype");
}

h1,h2,p,a,div.content {
  /* refer to the font "nickname" to apply it to the elements you want */
  font-family: "acoustic";  
}