Thirdly, monkey-making - honestly the way that most of Buy RuneScape Gold Sal's members made their money was outdated or, in some cases, requires higher statistics. There are a few things I'm pretty certain are solid - firstly pottery is expected to earn around 50K an hour, which is ideal for your skill levels (fun point - I never have more then 100K until I reached level 63).
So, before you think you're not good enough, think about my broken heart, in the past).Slayer can guide you to an acceptable profit once you have joined. Additionally, mining pure essence (requiring 30 Mining) isn't that bad, most likely about 1.5x making soft clay.
That's the main reason why I suggest PK'ing, by the way - once you've reached 100 CB you'll be needing more and more money which is really awkward because you don't have enough necessary stats to succeed killing the top monsters for HUGE profit, but still need lots of cash...