You must help the people of the Dunbog as much as you can, then meet with Nona in Carreglyn.
'The people of the Dunbog have been on the edge of the coming conflict for some time, forgotten by all but their nearest neighbours. Did Saruman factor them into his calculations?
'We must help them resist him, ${PLAYER}! They remind me of my own people, estranged from the other clans, and I do not want them to labour alone. Help them resist the Wizard.
'When you are satisfied that you have done all you can for the people of the Dunbog, travel to Carreglyn. I will meet you in Barnavon, for it seems to be a village of some importance, and Lheu Brenin wanted to learn the status of the mines of iron.'
You should help the people of the Dunbog with their worries, then meet up with Nona in the town of Barnavon, in Carreglyn, when you are satisfied.