Furnace operation is quite nice, but it seems very easy to train, too: refining ten lumps of coal and four 'smelt bronze from ore' jobs got a rank newbie up to adequate or competent. I think the dwarfs get skill per item created, thus refining bituminous coal and making alloys from ore (bronze most generally useful, brass most valuable; fine pewter gives most bars per job - sixteen) should allow you to get a decent furnace operator quite fast, along with a nice big stash of useful raw materials.
Own fort: i gave up on the low-minerals world.
Round the first: With no trees, no coal and only tetrahedrite for ore, i quickly started asking myself why i should actually defend this dump against the constant goblin ambushes. So when yet another ambush loitered around the map for a month and then uncloaked when i finally told my mechanics to reload the stonefall and cage traps of the first line, i decided if the goblins wanted the place so badly, they could have it.
Round the second: peaceful place by the ocean, 'shallow metal' and aquifer shown for the ocean, aquifer and soil for the land. There's no aquifer in the land biome, which forces some dwarfs to drink from a stagnant pond in the first spring. Found some caverns with nothing of interest, so took a gander at the ocean biome. I didn't see any shallow metals there - because i couldn't even look at ten levels of it, they were solid aquifer all the way through. I'm not strictly against no-metal embarks, but i find it hard to muster the enthusiasm with invaders on. At this point i just junked the entire world and re-generated with a much lower mineral scarcity.