The Wombats advice is good.
EPUB uses the 'box model' when constructing a block.
Think 'Shipping container' when constructing a book.
Each Section of the book is a 'Case of x' A typical book will have N cases of
Chapters
In most cases, your case of 'Chapter' can look very much like the paper version if it were all strung
end to end. That is as fine a breakout as you probably want to go (normally. There may be a case where you force a chart/table to start on a fresh SCREEN so it will all show at once. ).
The rest is artistic layout.
