I’ve taken the args from different some documentation on a GitHub page I can’t find anymore, but the post I linked to does document the ones I know.

args[1] --entity that received the damage.
args[2] --entity (or -1 for falling or drowning) that caused the damage.
args[3] --unknown, but it looks like a hash
args[4] --unknown, always 0
args[5] --unknown, always 0
args[6] --damage caused entity to die. Boolean.
args[7] --weapon hash. This can be a pistol, a grenade, unarmed, drowned, drowned in vehicle, fallen, etc. There's a lot of them, but it works with already known player weapon hashes.
args[8] --sometimes this is a hash, but usually 0. Something to do with vehicle collision? 
args[9] --sometimes this is a hash, but usually 0. Something to do with vehicle collision? 
args[10] --unk, always 0 in my testing
args[11] --unk, sometimes 1, but mostly 0. I think something to do with cops.
args[12] --always 1 if you hit a parked car. Otherwise 0
args[13] --some sort of flag. parked cars is 116. Otherwise mostly 0.

I usually get the bones from here: https://wiki. r a g e . m p /index.php?title=Bones. But a list like this: Bone indices - Pastebin.com will also do.

Note: The splitting of the r word is intentional as this forum does not allow it to be typed, just remove the spaces.