I would personally say, you just have to try things your self, like we all started somewhere, we didn't know what to do and how to do it, day by day passed and now most of us are here, where we can code simple stuff, items, monsters, some simple client editing, make a backup of your server, and mess around with the code, I doubt learning from tutorials will help you because none of the Visual Studio good tutorials would be referred to a RotMG Private Server section, just go into player.cs and mess around, go ahead and make yourself an unique behaviour, a one that none server had before, just try things out, atleast that's what I did, and I'm quite glad I did.