I have converted the PDF to a word document, but it is full of page breaks and other formating issues that I need to fix, but the commands in word do not work in correcting

I converted a PDF to a Mac 2008 word document and it has all kinds of page breaks that I can not delete, Headers that will fill in multiple pages that I only want on a single page and other issues.  I have researched word and formatting, but when I reach the section on deleting page breaks the boxes that you are to uncheck are already unchecked.  Also, I can not delete pages that I do not need from the document.  Can someone help?