To  keep  your  site  professional  and  the  formatting  consistent,  I  highly recommend being  conservative with  the  formatting options of  the editor (bold/italic,  bulleted  lists  are  usually  ok).  Instead of selecting Font family or Font Size, use  the  styles  that  are available  to your  template  if possible.

The main way to apply a style that was prepared in advance, is to highlight some  text and  then choose a class  from  the style menu. Some styles may also exist  in  the Paragraph Menu. These  are  called Heading 1, Heading 2, etc. Besides being a good choice  for head/subheads throughout your site, heading  use  relates  to  SEO.  Ideally,  all  style  choices  should be  consistent throughout your site. If you are unsure which to choose, try a couple and if you still have questions contact me.