Kobolds arrived on Oceana in 300 BCE. They initially landed in the southern part of the temperate zone, just north of the wine & olive band.
The Kobolds first war was with the Dwarves. As the kobolds lost ground, some clans scattered to other islands. This was particularly effective in getting away since Dwarves were not a seagoing race.
Over the next millenium, Kobolds, and many other races expanded to the west. As humans expanded, the Kobolds mostly moved further west. There were still some clans of Kobolds living in the eastern part of the world, but their size is small, and they have settled into a client status with the humans.
Kobolds are a clan based society. They fight among themselves as much as they as they fight other races.
Kobolds are carnivors. To the horror and disgust of most other races, they will chop limbs off of animals and sentient creatures for food and leave them alive for future slaughtering.