Basic Instruction #1: when placing a Word document, hold down the shift key as you click to place a page. ID will add as many pages as needed.
Can we interest you in a couple of Beginners' Book/Site recommendations? Because that on itself is not nearly enough to "convert a Word document to EPUB" -- by a very large margin. InDesign is not "a tool to convert Word to ePub with".
Shift click when placing the Word file.