Your return address should occupy the upper left hand corner. In the center of the envelope write the business name followed by the name of a specific person or division. Suite numbers go on the line before the street address. This is followed by the city, state and zip code.
Resumes vary greatly from one person to another, and one profession to another. So long as you make sure that your address is near the top of the page, clear, and easy to understand, you should be mostly ok.