Hello and welcome to Apple Support Communities, kenakahn.
If we understand your post correctly, you're trying to use FaceTime to call someone and you'd like to know what information you'll need. We’d like to help.
An Apple ID is needed for FaceTime. An Apple ID is an email address. Which phone number and/or email address you can reach someone with depends on the other person and what information they've set up for their account.
These articles will explain more:
Use FaceTime with your iPhone, iPad, or iPod touch
Add or remove your phone number in Messages or FaceTime
Let us know if that resolves this issue for you.
Thanks for using the Apple Support Communities.