At the end you should sign off with "sincerely yours" or any other related salutation. If you are applying for a particular job then you need to create letter of intent that contains the following. First of all mention your name, address and contact number.
Ziad K. Abdelnour, President & CEO Blackhawk Partners, Inc, the New York_based advisory firm on such matters, puts it this way: "Giving a Letter of Intent only means 'Yes I'm intent to buy the goods but I can change my mind anytime.' A letter of Intent is not a binding contract. [Hence] The Letter of Intent is a total waste of time on a worthless piece of paper."