Collect Feathers
A great way for new members with combat below 30 to make good money is to kill chickens and collect their feathers. Once you collect around 500 feathers, you can go to world one and sell them just to the East of the West Bank in Varrock if youre a Free to Play member. If youre a Pay to Play member, the best place to sell them is just North of the East Falador Bank. You can usually get about 10-20 gp each in members worlds. If youre looking to buy feathers, head to fishing shops and go for larger quantities. If you buy groups of at least 1,000, you can make a substantial profit. Its a good idea to sell to people, not stores.
Merchanting
Another way to earn money is by merchanting. There are several ways to do this. You can buy overstocked items in one store and then sell them at a higher price in a store where they are not stocked. You can also buy commodities that are being sold at less than market value and then sell them to other players who are willing to pay higher prices. In order to do this, though, it is necessary that you are aware of current market prices.
You can buy sharks for around 800 gp and later sell them for...