First learn how to use InDesign by buying a book or following lessons.
Page numbering is done by inserting the special text character/Marker/current page number in a text frame on a Master page. On document pages you can use Numbering and Section Options from the fly out menu in the Pages panel to define start numbers etc.
The best way is make 2 master-pages.
1 Master page; contains a page number
2nd Master page; contains none page number
Now its only up 2 you to add the master pages on the pages of the story.
If there are more pages with page numbers, i first should add to all pages (by selecting and adding) master pages 1 (with numbers).
Than scroll within the document and add the master pages with none page number on the pages thats should have none.
To reinstate the original text frame from the master page, reapply the master by dragging it from the top of the pages panel and dropping it onto the correct page in the lower section.
Thank you Peter;
I hadn't realized that master pages could be dropped on existing pages. I thought they were only for initial set up.