This article explains how to add a different header or footer to the first page of your Word document, or remove it from the first page altogether.
How to Apply Different Headers and Footers to the Same Word Document
Here's how to remove a header or footer from the first page only:
Double-click the header or footer on the first page to open the Header & Footer tab.
Select Different First Page to remove the header or footer content on the first page, while retaining the header or footer on all other pages.