For a newbie player of Runescape, that is a player of levels 3-25, the best ways to make a large and steady flow of money would be to collect and sell one of the following raw materials via The Grand Exchange in Varroc: bones, wool or feathers. Below, I've discussed elaborately:
Bones
Bones are very easily available; go anywhere that players are training and the ground will be littered with them. It takes about five minutes in a cow pen to bag an inventory load of bones. That's about 2,000 gold pieces in five minutes. Store each load up in your bank for as long as you want before going to the Grand Exchange, the more you have the bigger the haul will be. On a good day you could make as much as 12- 14k in half an hour.
Bonus: Few people know about this so there is little competition; bones are like money lying all over the ground in the Runescape world.
Feathers
Feathers are dropped by chickens when they are slain. Each chicken drops around 25 gp worth of feathers and 80 gp worth of bones. Most players can kill about 5 chickens in a minute. So you're making at least 525 gp a minute, probably more. In half an hour you can make about 6,000 gold pieces.
Bonus: You gain valuable combat experience points while making money.
Wool
The most profitable way to earn is sheep shearing. Each parcel of wool is worth 150 gp. It takes about five seconds total to get one. Therefore, in five minutes you could gather and bank about 4,000 gold pieces worth. So, in a half hour you could make 24,000 gold pieces... that's quite a haul for so little effort.
Bonus: Few people use this as a source of income, so competition is low and the market isn’t saturated.
Above were the short term options to make cash. There are other long term ways that will bring in tons of cash, but only after months of tiresome skill training. If that's what you prefer you should train skills that produce items that the Runescape community depends on. For example, fishing is one of the best skills to train because players buy large quantities of expensive seafood to take to dangerous areas such as the Wilderness. Mining and smiting are good because players will always buy armor and weapons. You can make millions by taking such items to market, but getting the skill will take a very long time.
