There are Conflict Zones in some systems. Fly there, choose one of two factions and kill everything that's not green3000cr per kill is not bad and it's fun.
Combat Zones are dangerous places and 3K per kill is nothing considering how much you would get for killing some of the larger ships at a Nav Beacon, a much safer environment.
They are quite a spectacle though.
For a combat ship I'd recommend a souped-up Eagle or Viper. They're the dog-fighting classes and most manoeuvrable in combat.