Unfortunately the EPUB export dialog only lets you set one paragraph style for an automatic break. It has been a feature request that you should be able to specify more than one.
But I think this should work, but might be a little bit of work:
1. You'll need to break your single file into separate files by chapter, and create a Book file to make them into a book.
2. In the first chapter, create a TOC style, and set the Chapter Title to be level 1, and probably the Section Head to be level 2
3. In your Book file, make sure that Chapter 1 is the Style Source (which is where the TOC style resides)
4. Export the EPUB from the Book file. On the Contents tab of the Export dialog, check Use InDesign TOC Style and pick the style you created. Check Break Document at Paragraph Style and select Section Head.
That worked for me to start each Chapter Title on a separate page and each Section Head on a separate page.
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Because that seems to be a useful technique, I just wrote up that method in more detail on the InDesignSecrets.com website:
Thanks Steve. I am brand new to InDesign so I think I take for granted a certain level of functionality but InDesign for epub is still relatively young. If Adobe keeps improving it, and with the ebook market increasing it could become the MS Word of e-publishing - and I mean that in a good way!
When I have completed all other areas of my book I will come back to the Table of Contents tutorial on InDesignSecrets.com as the final part.Ta.