The "best pserver source" is the prod source (which is in possession of Deca... Trying to email them to buy to have it for free would end up in denial and criticizing you in creating a unpermitted server). From what I heard, this website should do the trick.
. For xmls, I recommend using Notepad and/or Notepad++ since they're both easy to use. MVS (Microsoft Visual Studio) is the way to go, but (I think Arcanuo recommended this to me) Xamarin is also good. Both will require lots of storage space if you want to download one or both of these programs and code behaviors. Admins administrate... But there should also be Moderators that moderate in order to keep the server, Discord, and if possible... The forums, a friendly yet fun place to be in. You'll have to make a formatted application for staff members. Spriters/mappers must be able to show proof of their OWN work (there are sprite stealers out there so know who you can trust, and don't use sprite stolen work... Unless you're Nilly's realm which is ded'ed...). You'll know which people are good developers if they get down to the technical stuff. Lastly, you must be a strict, fair, nice, owner (or whatever you want the top position to be called). Getting work done, knowing how to setup VPS if you get donations, busting out a few jokes here and there, fixing errors and patching security glitches, and helping players rather than being mean all the time will be good for the server. Also, listen to everyone's opinions if you get the chance.