You can mine the ores in the /waste, meant for resource gathering, not /wild, meant for exploring. For iron you can also make an iron farm. For emeralds, it is better to trade with villagers. But if you want rupees, try to find the ores in the wastelands.
Thanks for all the replays I'm looking to buy, as I need mass amounts In process of making emerald farm, but I need emeralds to farm emeralds, and I need iron for beacons
Well I think the best way for you to start is getting a sugar cane farm, then some infinite villagers before 1.8 comes out ;3
i am in the process of getting an infinite villeger how do infinite villagers break I've now gotten all the iron i need