nginx and SSL reverse proxy. I have two questions about it.

Hello all. I am trying to setup nginx as a SSL reverse proxy for apache. However, there are few things I am not clear about.

1) I have created a self signed certificate for my apache server and they work. Would copying those certs/keys on the nginx server (under the proper dirs) would take care of the SSL communication between nginx and apache? Excuse my ignorance but just recently I started getting familiar with certs.

2) In the config file in nignx I need to enable *.pem. What kind of pem file are we talking about? A pem file with the Entire SSL Certificate Trust Chain? A pem file with the Private Key and Entire Trust Chain?

Thank you :)