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To get to the bandit training spot, use a dueling ring and teleport to Duel Arena. Walk straight south from the Duel Arena, until you hit the entrance to the desert. You will need to purchase a Shanty Pass to go through the gate into the desert. Right as you enter the desert, walk south-east and after a couple of steps, you will run into a man who gives carpet rides. You will need to take off your weapon and then pay 200 gb for a carpet ride to the Bedabin Camp. Once here, walk straight south and you will run into a group of 5 tents and buildings.
You will want to train in the three outer tents and buildings that contain 2 or 3 bandits. The big, southern building is the best as it has 3 bandits. There is a way to train in the bar with the level 74 bandits, but you will need tons of prayer pots and it will cost a lot more than training at the level 57's.
When you run out of supplies, simply walk to the center tent that is the shop. Sell your supplies and then buy them to obtain more supplies. You may choose to wear a ring of wealth. This will give you many Grimy Rannar drops from bandit training, which will actually make you money if you bank every time you have a full load of them!
