Hello, I'm an Rs member at cb level 106. I used to have the same gp problem but now I know how to make good cash. I'll split this guide into f2p and p2p.
---f2p---
1) Runecraft air runes at level 44+. It's slow to level up and slow money at first but later you'll get good cash.
2) Begginers kill cows in lumbridge for cow hide. Then, if you want, go to al kharid to tan it for additional cash. Sell at ge.
3) skilling (such as woodcutting and mining) are also good cash. When you get 70 woodcut, yews will be splendid money for you (about 100-500k per hour). If you have the patience and get a extremely high mining level, you might be able to mine runenite (worth 18k so far).
---For p2p---
1) kill dragons. Only kill the dragons that you can bank fast at and can kill fast. I don't suggest red dragon + unless you have a high summoning ( packing familiars) or high range. Metal dragons are hard to kill but give splendid rewards. Yesterday I just got 2 dragon platelegs. They are easiest to kill with magic and you still get cash if you keep the bones. If you'll be maging, bring runes for fire bolt and have chaos gauntlets (from family crest) and a good bonus staff. (ancient staff recomanded)
2) 85+ wc, cut magic trees, slow but good cash if your higher level.
3) fish at catherby/fishing guild/living mineral carven for fish that are swordfish+. You may also fish monks after the swan song.
4) Farming, since I have school I normally just plant some herbs in the morning, check it when I'm done with classes. Plant some more, and checking it when I have the time. I usually get 500k per day so its easy cash while you do nothing. When you do the above methods, you can also keep herbs planted and check every 1.5 hour or so.
I don't really recommand merching unless you want to risk your cash. If your willing to risk cash, I suggest (if your high level) going to god wars dungeon or kill something dangerous. You can find lots of great monster guides if you go to google and search.
---f2p---
1) Runecraft air runes at level 44+. It's slow to level up and slow money at first but later you'll get good cash.
2) Begginers kill cows in lumbridge for cow hide. Then, if you want, go to al kharid to tan it for additional cash. Sell at ge.
3) skilling (such as woodcutting and mining) are also good cash. When you get 70 woodcut, yews will be splendid money for you (about 100-500k per hour). If you have the patience and get a extremely high mining level, you might be able to mine runenite (worth 18k so far).
---For p2p---
1) kill dragons. Only kill the dragons that you can bank fast at and can kill fast. I don't suggest red dragon + unless you have a high summoning ( packing familiars) or high range. Metal dragons are hard to kill but give splendid rewards. Yesterday I just got 2 dragon platelegs. They are easiest to kill with magic and you still get cash if you keep the bones. If you'll be maging, bring runes for fire bolt and have chaos gauntlets (from family crest) and a good bonus staff. (ancient staff recomanded)
2) 85+ wc, cut magic trees, slow but good cash if your higher level.
3) fish at catherby/fishing guild/living mineral carven for fish that are swordfish+. You may also fish monks after the swan song.
4) Farming, since I have school I normally just plant some herbs in the morning, check it when I'm done with classes. Plant some more, and checking it when I have the time. I usually get 500k per day so its easy cash while you do nothing. When you do the above methods, you can also keep herbs planted and check every 1.5 hour or so.
I don't really recommand merching unless you want to risk your cash. If your willing to risk cash, I suggest (if your high level) going to god wars dungeon or kill something dangerous. You can find lots of great monster guides if you go to google and search.