So far the campaign will feature larger goblinoid like bugbear and hogboblins dominating and various other allies or villains, such as clans of kobolds, a hag druid nearby, a pack of wolf or worg, barghest hiding in clan etc..
The clan will be lawful in nature, and evil at its core, having a certain honor code where they're loyal to one another in the clan, but not as much to non-goblins. The clan will be in constant conflict with dwarves gnomes and halflings from the nearby hills and mountain, as well as elves from the forest and humans from nearby communities.
Since goblins don't have easy access to human town's marketplaces like in a typical campaign, trade will be conducted via barter, trading various previous metal, objects, weapons and armors for other needed materials.
During larger raid, i may have volunteer players also run 1-2 goblin monsters each on their initiative in addition to their own character, and as the tribe loose goblins to attack launched or suffered, i will emphase goblin clan member being refilled due to faster birth rate and growth of goblins compare to humans that take much longer to mature.
Slavery will be featured in the campaign. Goblins will collect slaves, mainly humanoids, demi-humans and kobolds, for food or mining work.
Goblins will regularly watch or patrol inside and around the lair, hunt or gather food for the tribe, explore their surrounding, and pillage nearby farms and settlements for ressources, livestock, slaves, prisoners or food.