Important information that should be in an internship offer letter. Before you get started on sending out applications, make sure that you have your resume up to date and have fully filled out all your Handshake profile details.Form 4: Letter of Acceptance. Note: Form must be typed. The Professional Internship Program at Southern Utah University provides students opportunities for paid internships as they finish their higher education. Applicants to the internship will need to include one letter of recommendation in their applications. When you sign an internship offer letter, that means you have accepted the offer. The first thing you will need to do is to fill out an application to determine eligibility for a CTE Internship. Please include: • Cover Letter. Please speak with the hiring manager when contacted for an interview about the internship duration.