You will get your missions from Marty by answering the phone booth located outside Bitch 'n' Dog Food near Joey's place in Portland.

Mission 1: The Crook
Location: Portland
Reward: $1000

Go into the factory area and get into the car with the blue arrow over it. Drive to the pink dot on you map and pick up Chonk's bank manager. Drive him back to the factory then park in the blue cirlce. Then drive the car to the crusher to complete the mission.

Mission 2: The Thief
Location: Portland
Reward: $3000

Go into the factory area and get into the car with the blue arrow over it. Drive to the pink dot on you map and pick up the two thieves. Drive them back to the factory then park in the blue cirlce. Drive the car to the Pay 'n' Spray, then to the pink dot on your map to complete the mission.

Mission 3: The Wife
Location: Portland
Reward: $2000

Go into the factory area and get into the car with the blue arrow over it. Drive to the pink dot on you map and pick up Chonk's wife. Drive her back to the factory then park in the blue cirlce. Now you need to drive the car into the water. You can do this in many places, just park the car near the edge of the docks then get out and push the car into the water.

Mission 4: The Lover
Location: Portland
Reward: $4000

Go into the factory area and get into the car with the blue arrow over it. Drive to the pink dot on you map and pick up the lover. Drive him back to the factory then park in the blue cirlce.