A cover letter usually is three paragraphs long and outlines why you are applying for a specific position, a brief overview of your professional background. A resume is a one-page document that highlights your background, skills, and experiences.It shows your "personal brand" to a potential employer. Spend some quality time reviewing the interview pack or guide. Some companies will give you some guidance when completing an application form. 1. First paragraph should grab the reader's attention. Getting started guide: Resume Writing. Starting from scratch or updating an old resume, this guide will help you create a winning resume. It doesn't matter what time you send your resume because you are sending it to a work email. And the hiring manager only checks it during business hours.