Not exactly true. You have to start off robbing "Man" to get your level up. There is not a stall for a level 1 thieving. Pretty decent Tutorial though.
Thieving is a good starting way to make money, but over all you can go kill things such as the KBD (King Black Dragon) at train (::train). It drops the Bando's GodSword so you can sell it [or you can go through the GodSword Mini Game () to get a couple of GodSwords to sell], plus they drop other items such as the Dragon Full helm, Dragon Boots, Dragon PlateSkirt, and Dragon PlateLegs to gain money to buy Dragon Claws at the shops (::shops) so you can deal out more damage and kill monsters faster to gain more experience and money.