Employment Offer Letter Instructions. Learn what to include in a job offer letter and use our ready made template.A Michigan employment contract agreement is a document that an employer will use to define the terms of the position for which an employee is hired. Offer letters must be prepared to preserve at-will employment status unless the employer consciously decides otherwise. See Preserving At-Will Status. Need help drafting a job offer letter? Use a Michigan employment contract template to outline the terms and the benefits employees will receive from an employer.