If you are looking for new fonts online, a simple search like "free fonts" will get you a large number of hits (probably more than you want to deal with.) You simply choose the fonts you want, download them, and place them in your C:\windows\fonts folder. They will appear in your WP fonts drop-down window, if you are using the Application toolbar, as well in your top-line menu, Format, Fonts choices. The downloaded files will have a .ttf extension.