My Struggles Talking to an Old Piece of Junk (Fanuc 0M)

This February I became the proud owner of an old Hermle UWF 851 vertical machining center. An industrial CNC mill with tool changer and everything. I already had a FoxAlien Masuter Pro (which seems laughable in comparison) and a lot of 3D-printing experience so I knew GCode. The workflow I was used to was to draw things up in CAD, do CAM (or slicing for 3d-printing) post-process them somehow and load them onto the respective machines. I knew the Fanuc 0M theoretically had the capability to get..