Draft an email to your supervisor. Be sure to put it in the appropriate format. This should be 200-350 words and you want to address your desire to hire an additional staff member to work in your department. You can determine the department. You also need to develop a job description for the new position. Make sure you submit both the email and job description.
Remember even emails need an introduction that states the purpose of your email and a conclusion to ask your supervisor what you would like.