How to connect Macbook pro's Retina screen with my Mac mini?
As far as I'm aware, it's not possible to run a Macbook Pro in Target Display Mode, only iMacs.

Ref: Apple KB - Target Display Mode: Frequently Asked Questions 

BTW, VGA or Ethernet to Thunderbolt is a physical impossibility.
Your cables must be  Thunderbolt to VGA / Ethernet.