You must help the people of Carreglyn stand against Saruman, if you can, and when you are satisfied, Nona thinks you should meet up with the Rangers in Gravenwood.
'I do not think Carreglyn is lost, ${PLAYER}. There are still good people in this land, strong warriors who did not accept gold from Saruman to fight his battles. Help them as much as you can! If we can aid them, they may stay resolute against the Wizard.
'Just inside the boundary of the Gravenwood, to the east, one of your Ranger friends has established a small camp. Once you have helped the people of Carreglyn to your satisfaction, travel east into Gravenwood and meet up with this Ranger.'
The Ranger Amlan is east of Carreglyn, just over the border with Gravenwood.
Nona wants you to help the friendly people of Carreglyn as much as you can and to then meet up with the Rangers in Gravenwood when you are satisfied.
Saeradan is at the Rohirrim Scout-camp, east of Amlan's camp in Gravenwood.
Amlan told you that a small party of Rohirrim have come to Gravenwood and are meeting with Saeradan.
Théodred is at the Rohirrim scout-camp in Gravenwood.
You have encountered Saeradan again and he has introduced you to Théodred, the son of the king of Rohan.