Hi my name is Butcher I hope i can help you with your money making problems.Well the best way of making money is probobly theifing to get started type ::ardy.
as you can see there alot of npcs and stalls.I will tell you now what stalls are for what levels
Baker stall:lvl 1 gives 1k and a chocolate cake and a normal cake. Silk stall:lvl 20 gives 4k and silk there are 2 of these stalls.
Fur stall:lvl 35 gives 10k and 1 lobster and 2 rune arrows.
Gem stall: lvl 75 gives 30k uncut dragonstone and a sea turtle.
Spice(rune)stall:lvl 80 gives 50k 5 rune essences 1 blood rune 5 nature runes.
Heres a ScreenShot of ardougne:
Here are all the stalls on the mini map