My friend was a philosophy major and studied metaphysics, which really interests me. He said I can pick his brain, so I was wondering if there are specifics I could ask to help me understand metaphysics a little better?

I am currently an undergrad right now majoring in philosphy. I would like to go to grad school and study metaphysics. The problem is, is that metaphysics is a very small branch, and I am having a hard time finding a grad school where I can carry on my studies. So are there any universities that offer metaphysics as a grad study ?