If you want to delete page number from a certain page (e.g. first page or table of contents) you'll have to let Word know that those pages are separate to the rest of the document in order to disconnect them from the rest of the numbered pages. By doing this you can start page numbering from a different page than by default and/or number some of the pages individually.
Instructions for page numbering (Microsoft)
How to recover lost or deleted files?
Navigate to the folder that used to contain the file or folder, right-click it, and then click Restore previous versions.
Recover lost or deleted files (Microsoft)