You go to Edgeville north of barbarian village.
Near the bank of Edgeville there will be a hut kind of thing
where there are monsters called Man, or Woman
their level is 2, so kill them and take their bones.
Then repeat that process and get 28 bones in your inventory.
then bank the bones, then repeat the process
Try to do as much as you can.
bones generally are 60~80 coins in the grand exchange
So one full inventory of normal bones would be average
1,680~2,240gp.
It is pretty fast because in Edgeville there is a bank really near by the
monsters.if your fast enough you should be able to do about
300bones/h which is about 18,000gp ~ 24,000gp
This is a simple guide for new starters.
this way you can level your guy
but keep in watch of your constitution(health point)
If you die you can set your Hob as edgeville and return to edgeville
and go to the place you died and pick up the items then bank them
again. then repeat.