Keep accomplishments concise with crisp phrases. Check and double check spelling and grammar. The resume should be no more than two full pages except for the occasional senior executive resume, which can go to three. Eliminate all irrelevant data. Unless there is an important reason to do so, don't put anything about references, age, marital status, sex, race, family, personal interest, political or religious affiliations.
Resumes are like an inverted pyramid, with the most important information on the first page.