1.Go to the Barbarian Village located west of Varrock, climb down the hole.
2.Go to the Minotaurs on the first level (they are level 12). Or you can go to the goblins. Goblins recommended for lower levels.
3.Start killing them until you get some bones.
4.Once you have a couple of bones ,wait about 15 mins,and bury a bone . There is a 100% chance that you will get a random event. # You will need to wait about 15 minutes until you can try it again.
5.Do this for about an hour and you'll make a lot of money.