Talk to Charles in Hub and say that you're looking for work. If you have reached the 15th level he will show you a location of a small raider camp that should be cleaned out.
This quest is recommended for characters with 150hp or more and/or some decent armor and weapons, since you'll need to kill humanoid NPCs that carry weapons that can sometimes burst you 4 times in a row on long range (for example, there's an NPC carrying an Assault rifle). The smartest way to complete this quest successfully is moving hex by hex and falling back every time a single NPC starts chasing you. 3 or more Super Stimpacks and/or higher first aid skill will be required in case you attract 2 or 3 raiders at the same time.
After you kill all raiders you'll get a notification. Make sure you loot all the bodies, since this location will disappear after you exit to the worldmap.