Once that CV or resume is done, start working on your cover letter. Unless the prospective employer or school asks you not to, your CV should always be accompanied by a cover letter.
I found this page from Trinity College very helpful. It gives you a step to step approach on how to write a cover letter and has samples posted. Check it out.
http://www.trincoll.edu/depts/career/guides/cover_ltr.shtml
