Keep exploring, get off the starter island--you'll find runestones eventually. Gotta keep going, maybe get on a boat and sail to next island if the starter island doesn't have what you're looking for. Explore--it's a big part of the game. They're out there, lots of them, just keep hunting around. Or, if it's just too hard and you don't want to find it the normal way, then go onto the seed map generator and have a look. There are ways to get what you're looking for, inside the game and outside it if you need that help.