My dad got me a Zoom R16 audio interface, and I have no idea what it is, how it works, or how to use it. I would like to be able to use it to record music, so I would like to know what it is for and how to use it with Cubase.
Lucky you 
It’s a really cool box that can do loads, far more than can be explained quickly on a forum.
Pop open the instruction manual and start at the beginning.
When you get really stuck, come back with some specifics and you’ll get plenty of advice 