Picking the fruit
You start with going to one of the fields. Press escape to go to the map, and find an apple or an orange icon. The apple icon is above Sandy Shores, on the North side of the lake. The orange icon is West of the Diamond Casino. Head over to the location on the map, and you will see tree's appear. Go to the tree and press '' to harvest the plant, you will notice you will get unripped oranges/apples. You can fill your vehicle by pressing ' ' and dragging the product into the inventory of the car.
Selling the fruit
Selling fruit is completely within roleplay. For that you have to head to a player owned store, marked on the map as a golden basket, or a player owned restaurant, marked by a golden fork and spoon on the map. Talk to the owner of this store and sell the unrippen fruit for an appropriate price. You can contact the owner of a store/restaurant by asking for them in public, or giving a shout out on twitter.