I accidentally deleted the app off of my iPad how can I get it back on my iPad

There's no way to delete the App Store app. Check better if you have accidentally moved it to a different screen page, or into a folder.

If you still can't find its icon, please check:

Settings>ScreenTime>Content&Privacy Restrictions>Itunes&AppStore Purchases>... the first 3 options must be set to "Allow". When done, restart your iPad.

Regards

Giulio