I am writing to express my deep interest in the open elementary-level teaching position in your school district. 1. First paragraph should grab the reader's attention.I am writing to apply for the Substitute Teacher position that was advertised on your website. When completing the online application, be sure to check "Wake County. Things to consider before applying for a job: 1. Create or update your resume. Complete the Employment Application. Select the position posted for Daily Substitute Teacher. A cover letter is a one-page story, directed to a particular position or employer. Focus on starting with a compelling hook and captivating content.