1. Manual page breaks should be avoided; they make editing much harder.
2. You could use page-break-before paragraph formatting in your Heading 1 style.
3. You could use an odd-page section break to begin your chapters. Do this only if you need a chapter to begin on an odd page.

If you are writing your book without using styles to help you, you are shooting yourself in the foot. Importance of Styles in Word

Here are some links that may make your writing easier:

• Word's Reveal Formatting Codes
• Basic Concepts of Microsoft Word - from Shauna Kelly