The most important elements in a thirty day notice are the relevant dates. The first significant date is the date that you write the note on. The next is the date that you intend to vacate on. The last element is obvious: state the details of your intended departure.
Begin by using the landlord's name and property. State the following: "Effective (Date), (Name) will vacate (address). Sign and date. Have landlord sign, date, and copy for your records.