According to Formatting & Submitting Your Manuscript, here are the specific rules to formatting a manuscript you should adhere to before shipping your work off to potential agents and publishers.
→ Use a 1″ margin on all sides
→ Use a title page which includes Book Title, Author's Name, AWC (Approximate Word Count), Author Information (Name, Address, Phone Number, Email).
→ Don’t number the title page. Begin numbering with the first page of the text of the book, usually the introduction, prologue, or chapter one.
→ Use a header on each page, including your name, the title of your novel in all caps, and the page number.
→ Start each new chapter on its own page, one-third of the way down the page.
→ The chapter number and chapter title should be in all caps, separated by two hyphens: CHAPTER 1—THE BODY.
→ Begin the body of the chapter four to six lines below the chapter title.
→ Indent fives spaces for each new paragraph.
→ Double-space the entire text.
→ Use a standard font, 12-point type. Times New Roman, Arial, or Courier is fine.