Turfing requires you to be part of a group and you must be a gangster (use '/gangster'). The whole of Los Santos is split into 100 x 100 meter turfs. You stand in another groups turf to take it from them and defend your own turfs from other groups. Payment is based on how many turfs your group is number 1 controller divided by active turfers there are in your group. Spraying graffiti in a turf can help increase your groups control, buy a spray can from a shop and use '/graffiti' to pick a spray.

Standing in a turf every minute increases your groups control by 1. Spraying graffiti sometimes increases by 10. Killing someone increases by 3. Getting killed decreases by 3. Control will decrease by 1 every hour. If 10 groups have some control over a turf, any points you earn will count towards removing group 10's control until it reaches 0 then your group will start taking control. To see the 10 groups and their control over the turf you're in do: '/turfcontrol'.

copied from F3 > LS Turfing