A cover letter is just as important as resume. It is an opportunity to personalize resume and sell ones skills. Include important sections to be included in cover letter are Heading and greeting, Opening and introduction, Body, Assertive closing which are described in detail in this paper published by North Star. This paper also provides some tips to write a fresh and informative cover letter.
An inquiry letter is similar to a cover letter. The big difference it is sent as uninvited (or as a cold contact) to an employer. Send inquiry letters to potential employers who have not advertised a job opening. By using the letter to match the qualifications to the needs of the employer an inquiry letter should include a specific contact name and title at the company, an attached resume etc. This paper explains how inquiry letter should be.
This paper from North Star explains that interviews are very important. Employers interview candidates to find a good fit for their business. An interview is opportunity to learn more about an employer and the available job(s). There are two main types of interviews: job interviews and informational interviews. Although the tips and strategies for each type are unique, preparation is key to both.