I'm a 16 year old from coastal Norway in the early 9th century. Do I encounter propaganda encouraging me to raid/trade/settle on the coasts of northern and western Europe? If so - is it entirely oral?

This is going to be really tough to to answer since the Norse didn't keep written records of anything. If there was propaganda, it probably wasn't written, or not written in a widely distributed way, but we really don't know since we only have a handful examples of Norse writing from that period.