- Tulup plant: In the elf village Ebron.
- Iron Request: You can purchase Iron in Ebron, Diminus Castle, and Kagabangui.
- Armor Breaking: You need to speak with Knocky in Ebron.
- Steam Gun: You need the pick-axe from Knocky in Ebron first, to mine ore in the Spire of Courage or dungeons in Dorgania, to craft steel with coal and iron.
You get access to Dorgania after advancing the main story some more.
You main problem seems to be that you have yet to find Ebron. The FAQ section of the walkthrough helps greatly in such cases:
The party doesn't know the location of the elf village at first. If you talk to the elf at the blacksmith of Aldlyn with Mirel in your party he'll offer you to show you the way to their village. After talking to him again in the bottom left corner of Aldlyn you're shown the way to the village and it'll appear on the worldmap.