How to make loads of money in runescape?

You might really want to do some woodcutting; at 60 woodcutting you can cut yews for around 430gp each. When I had 69 woodcutting a while back, I cut yews for around 3 hours and ended up with 400k. If not, do some slayer because you get good drops from time to time and level up your combat.