You would be better off learning to navigate the terminal. As for whats happening when you vnc, yes it will do that, its giving you a new session, and when you close it, its logging you off and closing the session. As for actually running it, I am unsure, I would have to set it up myself via terminal to actually get it right, I would read around about how to use virtual box and openSUSE.
As I searched around I came accross this: Click Here
It seems to be a pretty complete guide to do what you are trying to do.