How to start developing MU server files

Hello,

I really have some ideas to start developing some version of MU Online, there were many tryings with to do something from scratch. Is there any tutorial with some basics? Which software use, what language etc..

I know programming, but don't know system files of MU online.

I googled but didn't find any information. There are only tutorial how to create MU server with downloaded files, it's something what I don't need. I want to contribute with some features.