I'd suggest Slayer. Slayer exposes you to OSRS gold numerous creatures that all offer plenty of cash, generally. You are able to choose from this point on what you prefer to take down.
Blue Dragons are excellent moneybut the drawback is that you must have 70 agility it to work. Until then, you could be able to kill Black Demons, for money or perhaps. The best gear for you (considering your financial situation) would be:
Melee Guthan's Gear (Around 3M, but it doesn't require food on a melee-able slayer work) Ariel's Gear (1.5M offers an additional prayer bonus) The ranged version is a good choice. Karil's set. I'm not sure how much though. It is possible to use Royal D'hide priced at a reasonable cost. MageAhrim's set cost 1 million. You can upgrade it to Ganodermic, which is around 3M.
Please note that all Barrows set (Ahrim, Dharok, Guthan, Karil, Torag and Verac) all offer identical bonuses. The set capabilities are distinct, however- of note are Dharok's gear, which lets you hit harder even as your health decreases Guthan's equipment, which allows you to heal as much as you hit, and Verac's gear, which PROVIDES A PRAYER BONUS that the other sets don't provide, but also the chance to hit much more accurately through prayer and armour. So, you can purchase the most affordable melee set (Torag) and make use of food.
Major modifications: Evolution of Combat (EoC) It pretty much overhauled the entire system of combat, however, it's not too difficult to learn to buy old school runescape gold (certainly makes combat more fun).
