Calling out

You can't make phone calls from an ipad without an associated iphone.

There is no dialer, you use the + symbol and enter the info for your saved contact inside the facetime app.

The iPad User Guide for iPadOS is a rich source of guidance and information about using the many features of your iPad - such as FaceTime. These pages from the User Guide should provide the help that you need:

Set up FaceTime on iPad - Apple Support

Make and receive FaceTime calls on iPad - Apple Support