It's up to you how much information you divulge about your new gig. But it's usually best to keep it short and sweet.In the opening paragraph, clearly state that you are resigning from your position. Be Concise and Clear: While expressing gratitude is important, keep the letter concise and to the point. You want to give at least a two weeks' notice. In the opening paragraph enter your name. Next enter your position. In the letter of resignation, leave your basic contact information in the header. Learn how to write a professional resignation letter with our expert tips and templates. Learn how to write a professional resignation letter with our expert tips and templates.