The easiest and cheapest way was craft Iron Daggers, with the experience buffs from either the Lovers Stone (need to go to the stone in east of Markarth; gives +15% exp bonus), Lover's Comfort (need to have a house + wife, and complete some quests; gives +15% exp bonus), or Well Rested (sleep on the bed that you own, or at the inn; gives +10% exp bonus).
For easy smithing + mining ores, go to Riverwood. There's a Blacksmith there, which you can use to smith the weapons, and also an Iron Mine just south of the town called "Embershard Mine", which you can mine if you need free ores.
Craft the Daggers until you ran out of ores, and then sell it to the stores in the town. You can also buy ores/ingots with the money you got from selling daggers.
But if you got loads of money and/or Gold Ore/Ingots, then yeah, craft Gold Ring instead of Iron Daggers. This is because 1 Gold Ingot will become 2 Gold Rings, which gives you more exp than the daggers.