The Apple Watch doesn’t work with the iPad, which means that you can’t install the Watch app on your tablet. Moreover, you can’t pair the Apple Watch with an iPad.
The Apple Watch is designed to work with the iPhone and as such is not compatible with the iPad. This is true for all Apple Watch models.
If you have an iPad but don’t own an iPhone, you won’t be able to use an Apple watch because you won’t be able to pair and configure it. Unfortunately, there’s no workaround — you can’t use an Apple Watch without an iPhone.
When you get an Apple Watch, you need an iPhone to set it up. Without doing this, the watch is just an expensive bracelet. As you might suspect, the Apple Watch is also not compatible with Android phones.