When you are applying for almost any job, you need to have a résumé and cover letter. Together, these two documents form the foundation of getting you to the first real step in a job application: an interview.
The cover letter tells the reader why you are the right candidate for the position. It is not a recitation of the résumé. The résumé is a succinct listing of your relevant work experience, your education and your personal interests. Your résumé will help the reader get a quick understanding of your qualifications. Both documents should be written to respond to the industry and position you are applying for. Pay close attention to having correct grammar and accurate spelling essential; mistakes in grammar and spelling can result in your application being rejected.
To get you started, check out the links in the margin. Your NH-INBRE mentor is a very useful resource in helping you prepare the best résumé and cover letter you can. Start the process early so that you have plenty of time for revisions and corrections before you need to send out your résumé and cover letter.