How do I link my IPhone and iPad together

Hi

Not sure what you mean if you want to use iphone as a hotspot go to settings

Enable hotspot on iPhone to contact to ipad.

Go to ibooks download ipad user guide its free .

Cheers

Brian

If I understand you correctly, you need to sign into the American ID on each device and enable the services you want to sync.

settings > iCloud for iCloud services.

Hi

Follow the instructions here to use Continuity features across your iPhone and iPad:

Use Continuity to connect your iPhone, iPad, iPod touch, and Mac - Apple Support