When playing humans, I like to use lamelar leather for 'padded' armour sets.
They take a bit to make, but it is a very decent early protection, with a solid armour layer and a fur for cold protection as an upper layer.
As for copper, I make cheap arrows/bullets, as well as trap weaponry and other shields to train my smiths.
Might not be the best strategy for massive army (lamelar divides your leather stock by two, and requires string), but it's the best protection I could figure out in my embarks (somewhat weak animals for easy leather).
On the 'copper is terrible' point, it's true, but copper is still better than wood weapons, when you only have this as a weapon metal.