1. Press control-a to select all text in the document.
2. Press control-shift-f to bring up the font dialogue. This lets you set
font style (time new roman, Ariel, etc) sie, and whether you wnt bold,
underlining, etc.
Note: I have no idea what effect, if any, this will have on header text, or
any other styles you may have selected.
c. With all the text selected, you might also wish to press shift-f10, then
select "paragraph" from the context menu which appears. You can set margins
and line spacing for the entire document.