Hi was wondering is there a way to delete a army or a single unit you don't need? Also under construction on some buildings I try to build it says I don't have the resource like iron? how do I get this resource?
Yeah, there is you just select the unit or just the army and you look for the dismiss button in the lower left. It should be a torn up flag, Japanese style. Should be pretty easy to spot it.
As for iron you have to look for provinces that have the iron resources, usually look for nations that seem to be able to trade iron, they have such a province. If you're lucky you can find some of the smaller clans with such a province.