P2P Moneymaking---- Um.. too many to list so I'll just list a few
1) Yew longs (req: 70 Fletch)-- Make yew longs (strung) and sell for 500 each or high alchemy them
2) Dragonhide Armor (req: 57+ Craft, 55 Mag)-- Buy green dragonhide for 1k each (easy to get at edgeville most times). Then make either vambs, chaps, or body and high alchemy them. Pretty good money but might take long.
3) Battlestaves (req: 54+ Craft, 55 Mag minimum)-- Buy battlestaves at either Varrock or Magic Guild. They cost 7k each. World Hop until you have around 100. Then, you make the glass orbs at Entrana =p. 13 per load there I think for maximum effect. Then you power the orbs at the respective altar. Then you high alchemy for 9.3k each... muhahaha. It's like 200k profit real quick but you need a nice amount of cash to start.
4) Combat (60+ atk for max effect)--- Go kill some slayer monsters. They drop really good loads of herbs and stuff. Or you could go kill other stuff, the list is huge so I'm not going to mention it.
5) Arrow Shafts--- Just stay at draynor village cutting regular logs and fletching them into shafts. Quick xp for lower levels and quick cash as shafts are 10 gp each and you get 15 per log.
I'm gonna stop now because....

I feel like it.