If you're going to put it on the kickstand you going to lose a little bit of oil just put a drain pan under there for now if you have wheel stands and get the bike upright shouldn't have to worry about any kind of oil maybe a few drops
Definitely something is in there hitting the stator and or flywheel
Yeah yikes! If I was you, I would just drain the oil. If it looks normal, then you probably didn't cause much damage. But if it's got a bunch of shiny bits in it, there might be something more wrong. I would pull off the stator cover and the clutch cover just to see both sides, but yeah if the sound is on the left side, check the stator cover first. Mind the magnets when pulling the cover off.