Hi subhojeetsantra,
My suggestion is to use Paragraph Styles in your first draft.
For example, to make it easy to conform to your publisher's requirements:
- do not use spaces to indent. Use the Ruler and Tabs.
- Do not use the enter key to create space between paragraphs. Use Format Panel > Text > Spacing > Before Paragraph or After Paragraph to make it easy to change later
However, I agree with Peter that your publisher will not accept a Pages document. They will not understand the format.
Good luck with your novel,
Ian.