Look this over carefully, it can help you. Clark
-- Online Editing Tutorial

Sonia Jaffe Robbins runs an editing workshop in
the Journalism Department of New York University.
She puts her course materials on line in what
makes a really interesting site if you want to
learn about the finer points of sharpening
your written style.

The site includes lots of downloadable guidance
notes and course materials. 'Banished words',
editing tips and issues, hyphenation, spelling
FAQs, plus lots of juicy links to quizzes and
tests, plus you can take the 'Gullibility Test'
at the Museum of Hoaxes, and you can even check
if people are dead yet or not.

Even if you simply read the course materials, you
will learn a lot about improving your writing skills -
and you should have plenty of fun too.

http://www.nyu.edu/classes/copyXediting/syllabus.html