So i have a house and a few NPCs in there. I want a bounty placed on players head for attacking them or stealing from them. The house is really close to Falkreath so I'd like the bounty to go to that aread.

I've tried adding crimefactionFalkreath, CrimeFactionImperial, TownFalkreathFaction but non of them are working. My NPCs will attack me for stealing or attacking but there's no bounty system.

I would try isGuardFaction but I don't want my regular NPCs acting like guards to take me to jail or get money from me.

It should work with crimefactionFalkreath. But have you added the faction as normal faction or using the http://www.creationkit.com/Faction#Crime_Tab In papyrus there's also setCrimeFaction() not simple addToFaction