Early ironman nats and laws can be hard to get. Laws are commonly farmed at Otherwordly Beings, and Natures can be farmed from Jogres. Hobgoblins also drop a fair amount. Darkwizards are only level 13 or 25 and can be found west of Falador. The best thing would be to focus on raising your combat skills and killing dragons or black demons. Once you unlock the Legends guild basement and have access to those and fire giants, runes and other goodies will be easy to obtain. Natures aren't really needed early on since you can sell to shops for a decent price, and go for other types for skilling to get consistent gp.

I personally farmed a couple of nats, and especially laws at chaos druids early on, although they only drop one at a time.
Unlocking glider and spirit tree transportation, using laws sparingly and making good use of the Home teleport spell goes a long way Eventually you'll reach the point where it all comes easy, especially after you've unlocked the quest cape, and eventually dragonstone amulets, after which you don't need many runes to get around.

Another option would be to buy the elemental runes from magic shops (varrock, port sarim or magic guild), and optionally combat runes at the mage arena shop, although those last ones are quite pricey.
Good luck on the account. May RNG be with you

thanks guys!