Yo Guyz
You can start Thieving at home near the bank.
All the stuff you collect while thieve you can sell Edge's Fence For a nice profit. (he is standing next to the stalls)
The first stall is the Banana stall and you need to steal here till you are level 30. Bananas sell for 3238 coins ea at Edge's Fence
When you are level 30 you can thieve at the ring stall keep thieve here till you are level 60. Rings sell for 6412 coins ea at Edge's Fence
When you are level 60 you can thieve at the general store wich gives you damaged hammers. Keep steal them till you are level 65. Damaged hammers sell for 10659 coins ea at Edge's Fence
At level 65 you can steal staffs at the magic stall keep steal them till you are level 80. The staffs sell for 14933 coins at Edge's Fence
At level 80 you can thieve at the scimitar stall and keep thieve here till level 99. The scimitars sell for 23131 coins at Edge's Fence
Donators
Donators can train thieve also on a special stall they are locate at ::mzone and plat/dia zone.
You can thieve here when u have level 80. The items wich you can steal gems at gems stall and other stall gives you steelbars,rune daggers,red vine worms,blue dragon hide and gold ores.
And they give lots more XP then the F2P stalls.
Enjoy