I lost my iPhone 12 pro max

Hey there, you can locate your iPhone via FindMy if it is enabled. You can do this on that site or on your FindMy App on another Apple device:

https://www.icloud.com/find

If you need access to your Apple ID and forgot your password, proceed here:

If you forgot your Apple ID password - Apple Support

I hope this helps! Good luck!

Hopefully, you have another trusted device other than your phone. If you do not, resetting your Apple ID password is going to be a bit challenging.

Also, see here:

If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support