My own tutorial video on setting up rAthena for RO. It's very straight-forward and easy to setup rA server locally :) Forgot to mention that you need Visual Studio with C++ Development installed.
Links in the video:
https://github.com/rathena/rathena
https://github.com/Neo-Mind/WARP
https://github.com/llchrisll/ROenglishRE
https://www.apachefriends.org/downloa...
http://nemo.herc.ws/downloads/
http://nn.ai4rei.net/dev/rsu/