How could I make money in runescape?

with you decent combat skills i suppose you could kill black demons. They now drop infernal ashes which sell in the grand exchange for about 4.7k each. They also drop many other valuables like rune armor, dmeds and dragonstones. Bring a terrorbird and loot the crimson charms infernal ashes and valuable other misc drops and you could make over 120k per load i believe. Spend the 2m that you have on high defence armor like torags and a whip/regen bracelet. Black demons are combat 172 and are found past the blue dragons in taverly dungeon. If you need help just add me "king maviel"